well since we are turning this topic in the weird fears topic 
when i was a kid, i used to run away from the bathroom when i flushed it - because i was afraid of the sewer monster coming out to get me, until my mom caughtme and gaveme a sermon on washing my hands (i was a kid for christ!)...
i don't run from the flush, but i've never been able to shake that a chill when i have to use it late night and all dark...
well i'm pretty sure i'm alone on this one, and i'm sure i'll never post anything this embarassing again