CAUSE @ EFFECT

If you were to spawn a rabbit in a container built out of non-translucent block ( think doors, fences, Iron bars and other full see through blocks) and you were to initiate some action that would cause the rabbit to run (Food, damage, etc...) the rabbit would clip inside the block and not be able to leave.

NOTES

• After some testing I found that rabbits are the only small mobs affected by this glitch. This might be because they jump when they move.