When setting a redstone clock to teleport a player's rotational axis to 1 and pressing T or /, the game can spin a head around and around.
I found this bug from this video, which sums it up pretty well:
https://www.youtube.com/watch?v=xtgOrIbzwqY
Linked issues
Comments 3
Reorganizing, marking this as a duplicate of MC-45104.
MC-58712, MC-45104, MC-49041 and MC-64248 describe all the same bug, maybe the should get organized a little bit better