Dear god. Creeper got in my house during a rainstorm. It was totally my fault, I panicked. He's in my 1st floor, I've put my entire house into lockdown and I'm in my experimental room where I test pistons. It has a piston door so I am safe, for now.
Gave me an idea though, make a small house, at the click of a button have piston's pull the floor out and have fire 6 blocks under. Decontamination.