Maybe Next Time Buddy is a Halo 3 Multiplayer achievement. It is awarded for boarding the same vehicle you've been thrown off of within ten seconds in any free for all playlist. The achievement awards the player 5 Gamerpoints.
It is represented by a red octagon with a hand making a "stop" sign.
A way to do this with the Banshee is to do an upwards barrel roll as you are being boarded. If timed right, you will be flipped upward as soon as you are ejected, and you can come right back down on the Banshee to re-board it.
The easiest way to get this achievement is to simply play a social free-for-all match with a friend to set you up.
The vehicle must still have the hijacker in it; if you kill them and then board the vehicle, the achievement does not count.
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