Not strictly a housemate
but I am on the same staircase as my friend at Uni. One day, I knocked on his door, no answer. I tentatively tried the handle, it was open, he was out. So, I quickly recruited a co-conspirator, and decided to wreak as much havoc as possible. We started off with unscrewing his light-bulbs. Then we stole his chairs, and his tables, set his computer to a rather obscene home page (you must have heard of it, it spins me right round), and then stole his mattress. But... we packed a load of clothes underneath his duvet so it appeared to all but the most discerning eye that it was still there. Then we played the waiting game.

When he finally arrived back, he discovered the light-bulb bit fairly easily, so he came out, we had a bit of a laugh, and he went back in. Two seconds later, he re-emerged, "where are my chairs?" We laughed, returned his chairs, then stole them again and planted them around the staircase, eventually he got them back at about midnight after I made him a treasure hunt to retrieve them. At about 8pm, he knocked on my door. He'd sat down on his bed. Little did he know we'd already surfed his mattress down some stairs and hidden it away.

I am a very bad housemate.
(LickOutTheJamsMotherfuckers!, Sun 8 Apr 2007, 12:56, Reply)