Using Onager early

On the level The Pillar of Autumn in Halo:Reach, it is possible to board and fire the Onager before you are supposed to. In order to perform the glitch, you must have a concussion rifle and a drop shield, and have the Tilt skull enabled.

First, stand on the railing of a small set of stairs leading down to the landing pad at the very beginning of the section Keyes. There should be a pipe to the top right, above you. Use the concussion rifle to launch yourself up by shooting at your feet, and land on the pipe. Then, launch yourself up again to the platform with the MAC gun. You can now operate and fire the MAC gun as normal and use it to shoot down the various Banshees and Phantoms flying around.

This YouTube video shows how to perform the glitch:

List of glitches in the Halo series

Halo: Combat Evolved glitches

50 Degree Banshee Fire • Air swimming • Assault on the Control Room shortcut • Banshee launch • Bullet hole glitch • Character stretch glitch • Clipping • Death by cryo tube • Easy Pyramid Structure • Fall damage reduction • Floating assault rifles • Floating plasma grenade • Frozen Elite • Grenade animation glitch • Grenade slide • Headless Master Chief • Immobile Banshee • Invincible Marines • Invisible Warthog ammo • Leak • No weapon glitch • Pelican death glitch • Perpendicular Banshee fire • Phantom Flood whip • Riding a Pelican • Shafted cinematic glitch • Shielded dead Elite • Speedy reload • Spelunking • Spinning gun • Stay in the Pelican • Stopping time • Suspended dropships • The Pillar of Autumn vacation • Treadmill trick • Three weapons glitch • Unarmed Marines • Unlimited enemies • Unresponsive enemies • Wall hacking • White weapons

Halo 2 glitches

Arbitrary unit possession • Aqua Chief • Banshee launch • Blue Jackal • Body separation glitch • Bouncing items glitch • Brute Buddies • Sword Climbing • Sword hijacking • Button combo • Cairo Station vacation • Character stretch glitch • Charging Needler glitch • Clipping • Creepy Cortana glitch • Driverless Banshee • Drop Dead on The Great Journey • Dual Melee • Enemies in space glitch • Faking Brutes • Fall damage reduction • Fighting Tartarus without fighting Brutes • Flipping a Phantom • Flying Arbiter • Floating objects • Floating in Relic • Flyboy • Flying Half-Jaw • Freezing Jackal • Get Into Sea On Regret • Get a Ghost stuck on the Scarab • Ghosts of Halo • Giant player model •Gravity throne hologram • Grenade lunge • Heretic leader glitch • Hidden subtitle in Halo 2 • Hidden weapons on Regret • Reaching the High Charity conduit • Hitchhiking Flood • Honor Guard Councilor • Hovering Arbiter glitch • Kill Sergeant Johnson glitch • Infected Brute glitch • Infinite Shotgun • Invincibility glitch • Invincible Grunt • Invincible Marines • Invisible bridge glitch • Invisible grenade throw • Invisible Sentinel beam • Invisible turret • Jackals' unlimited Plasma Pistols • Johnson disappearing on the Cairo • Knock the Prophet of Regret out of his throne • Light Eye • MAC gun glitch • Meet Johnson early • Needler Sentinel • No weapon glitch • Oracle elevator glitch • Oracle Super Jump • Orbital Insertion Pod glitch • Overload glitch (Halo 2) • Overloaded Backwash • Permanent invisibility • Phantom glitch on The Arbiter • Phantom riding glitch • Plasma Pistol glitch • Plasma Rifle overheat glitch • Quarantine Zone floor glitch • Quarantine Zone vacation • Riding a Pelican • Ring of Rockets • Rtas 'Vadum's eyes glitch • Save Marines on Sacred Icon • Silhouette Sword • Sliding Flood • Slow-motion grenade • Solid Patch of Air • Spectre jumping • Speedy reload • Suicidal Jackal • Super bouncing • Suspended Pelican • SWAT Suicide • Swinging Arbiter glitch • Sword flying • Tank jumping • Telefragging • Teleporting Half-Jaw • Triple wielding • Turf vacation • Unarmed Marines • Unlimited enemies • Unlimited Energy Sword • Unresponsive enemies • Uprising vacation • Wall Climbing with Vehicles • Wall hacking • Weaponless Elite (dual wielding) • Weaponless Elite glitch

Halo 3 glitches

"Friendly" Brutes • 3 Player Local Co op • Aqua Chief • Arbiter eye glitch • Artificial lag glitch • Arm glitch • Avalanche vacation • Banshee hovering glitch • Banshee launch • Battle Rifle ammo glitch • Blanks in SMG • Butterflying • CTF weapons glitch • Character stretch glitch • Clipping • Corpse Respawn • Crow's Nest entrance • Dancing Elite glitch • Destroyed vehicles glitch • Disappearing grenade glitch • Disappearing Truth • Drive an AA Wraith • Drop pod glitch • Elephant flipping • Elite helmet glitch • Equipment jumping • Flipping a Phantom • Floating vehicles/player glitch • Floodgate vacation • Flying dumpster glitch • Flying Elephant • Flying turret glitch • Forge turret glitch • Forward Unto Dawn glitch • Frozen Elite • Fused armor glitch • Ghost Forging • Ghosts of Halo • Hall of Mirrors •Invincibility glitch • High Ground vacation • Hold an Energy Sword like an SMG glitch • Infected Brute Chieftain • Infinite Marines glitch • Infinite weapons on Crow's Nest • Invincible Marines • Ledge Jump • Life After Death • Load glitch • Mongoose glitch • Monitor glitch • Narrows man cannon glitch • No weapon glitch • Nuclear bomb glitch • Out of Sky Bubble glitch • Overload glitch (Halo 3) • Phantom Flood whip • Phantom riding glitch • Riding a Pelican • Ring of Rockets • Roaming spectator• Rtas 'Vadum in crashed Flood ship • Sangheili neck glitch • Scarab boarding glitch • Secret room on The Covenant • Secret Room under Snowbound • Semi-fake area glitch • Silhouette Sword • Skipping the light bridge scene • Stasis field glitch • Stopping time • Sword deflection glitch • Teleporter glitch • The Ark vacation • The Bump • The Covenant vacation • Theater tricks • Three Johnsons glitch • Time travel glitch • Transparent scenery glitch • Triple wielding • Turret detach glitch • Turretless vehicle glitch • Two Arbiters glitch • Two Spartan Lasers on Halo • Unlimited ammo • Unlimited enemies • Walking in the Dawn • Weaponless Elite glitch • Zero-gravity glitch

Halo Wars glitches

Out of bounds glitch • Repairs glitch

Halo 3: ODST glitches

AI Super Jump • District loading glitch • Drive an AA Wraith • Engineer glitch • Kizingo Boulevard vacation • Roaming spectator

Halo: Reach glitches

AI Super Jump • Armor permutation glitch • Charging Needler glitch • Corvette vacation • Dancing Hunter glitch • Dead shielded Emile • Floating shot glitch • Forge physics glitch • Forge turret glitch • Forge World vacation • Fused armor glitch • Giant Spartan glitch • Infinite armor lock glitch • Jetpack glitch • Lone Wolf Spartan statue glitch • Miniature Spartan glitch • Monitor glitch • Nightfall forklift glitch • Nightfall vacation • No weapon glitch • ONI: Sword Base vacation •Pilotable Seraph • Rapid firing Fuel Rod Shade • Spartan in Autumn • Square-Gates • Tip of the Spear vacation • Teleporter launching glitch • Three invincible Grunts glitch • Trapped in drop pod glitch • Turretless vehicle glitch • Unintended firing glitch • Using Onager early • Weaponless Elite glitch

Halo 4 glitches

Boltshot reload glitch • Composer vacation • Floating Mantis glitch • Flying turret glitch • Forge turret glitch • Infinite Energy Sword on Dawn • Infinity vacation • Lightrifle Crawler • Lowering weapon glitch • Midnight vacation • Miniature Covenant glitch • Miniature Spartan glitch • Monitor glitch • No weapon glitch • Ragnarok vacation • Reclaimer vacation • Requiem vacation • Saving the Warthogs on Requiem • Shutdown vacation • Super grenade throw • Unlimited Dominion turrets

Halo 5: Guardians glitches

Armory Marine glitch • Armory roof glitch • Meridian Station launch • No weapon glitch

Halo Infinite glitches

Handheld scorpion cannon

Using Onager early

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