Hmmm, maybe its one of them insects that escaped from that government research center i heard about the other day. Apparently they escaped in some womans hair. They crawl off clothes in the washing machine, into the pipes. They then make their way to the boiler and lay their eggs. When these are laid, they grow to fairly big insects, with really hard claws. Once they grow so big, they try to get out. They are supposed to be harmless unless they get to bread. But you may not live anywhere near where it happened...