Somehow, a colony of gooey black mold decided to form on my toilet seat. I have no idea how long it was there without me noticing, and I have a sneaking suspicion I sat on it at least once. Ack.
It's gone now, and I'm about to give the seat a very good scrub with disinfectant, but how the hell did mold spring up pretty much out of nowhere on my toilet seat? My bathroom isn't even damp!