So I walked into my tiny base in Minecraft one day and saw a Creeper had infiltrated it. Naturally, I backed the hell out of there, and proceeded to kind of run around and plan what I should do, half-hoping he'd run out or disappear or something. Upon re-entering, he was nowhere in sight. Slowly, I looked around the edge of the short hallway my front door opens to... and there he was, two blocks away in the corner like Boo Radley.
He didn't explode, and later disappeared, but if poop was a material in that game, I'd have filled up a full 64 blocks.