Ever Wanted To Get Kicked By a Creeper?

Now, under the right circumstances, creepers can also deal direct damage to players, just as other mobs do, and not immediately explode when they get near players. If players swim directly under a creeper and make sure that it does not explode, it will cause direct damage to them. 

It also gives players a different death message. The usual “(Player) was blown up by creeper” message becomes “(Player) was slain by creeper” when players die due to direct damage from a creeper rather than an explosion by a creeper.