When swimming in water with the Dinnerbone or Grumm skins the legs will be messed up.

How to reproduce:
Equip the Dinnerbone or Grumm skins in the 3rd birthday skin pack( If you have them)

Then go into 3rd person

Then swim in a body of water.

There you go, the legs will appear in the body and head of the player.

I thought it would be like swimming backwards but it’s not.