A creeper spawns inside my tower, right next to a torch.
Minutes earlier a creeper 10 blocks away suddenly exploded by my side.
Creepers are the only mob worth hunting. In melee combat they explode without warning. Couple this with swords doing a bawhair of damage and they're pretty much impossible to kill at close quarters. This makes shooting them with a bow the only possibility. Of course, you need to fire 1000 arrows just for one of them to not bounce back.
See how mobs are adding absolutely NOTHING to SMP just now?