Weird....I've mentioned this on the board before....but I always check behind the shower curtain before sitting down to pee. You know, just in case someone is hiding in there. I'd rather die of shock with my pants up than die sitting on the shit-er.
A lot of the time I try to step on every crack in the sidewalk. I am not super obsessive about it most of the time... but once I start I HAVE to keep doing it or I get really uncomfortable and fidgety.