I still have my blonde moments, though.
Like when I was teaching a couple of years ago, I had said that distance is always positive. A student asked if distance should be negative if you walked backwards. So I demonstrated how there is a positive distance between us even when I walk backwards - and I backed into an overhead projector.
*snort*
s'ok... had a blonde moment of my own, back in 1988... biked face-first into a brick wall... see, there was this blonde...