Boats keep turning when exiting the boat when holding the boat control keys and there is a entity in the boat (Mob, Animal or Player) This can only be seen by the player who exited the boat.

How to produce:
1. Get a boat of any kind
2. Get a friend in a boat (or if you do not have any friends, just an entity)
3. While turning exit the boat
4. Watch how the boats spins.

Works on both land and water