fishing rods and zombies

i was on creative mucking about with zombies, giving them armour, heads, tools and items.
then i accidentally hooked a zombie with my fishing rod.

when i hooked the zombie (had a human head, held nothing) the fishing rod hood started to fly 2 blocks out of the zombie then back in then towards you 2 blocks then after a few seconds the hook including the line flew about 20 blocks away and hooked onto ground. then i reeled in the fishing rod and the zombie moved one block towards me even though the fishing rod had not been attached to the zombie.

will work on any game mode
1. firstly, give a zombie a human head
2. then hook the zombie
3. results should be instant
NOTE it works on sheep too