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What is 'stretched'?
This glitch makes MC's neck stretch, or sometimes makes his body flop. To do this, go onto the map Midship, and find one of the shields.
How to do it.
Crouch down and keep walking towards the shield, so you don't bounce away. Get somebody to 'assassinate' you. If you do this right, MC's head should go through the shield with his body on the otherside. The shield makes the body pull away, but it can't because the body stops it from doing so. This causes MC's neck to stretch like a rubberband. Sometimes it flops around like a fish out of water.