when i was being chased by some mobs i ran trough a rose bush
all mobs stopped and the creeper was about to explode when i hit him but he just got really fat
you can trigger this by making them run into rose bushes but you should also test it on other 2 block high flowers/bushes
it was for 1.7.9 but could only select 1.7.10
Duplicate of MC-3626.