Dumb Questions

Conventional wisdom (and a whole passel of primary and secondary teachers) says "there is no such thing as a dumb question."

I disagree.

Today, while looking at the empty chair of my boss, someone asked if he was around. Hmmm... Yeah, he's just covered with invisible paint.

What's the dumbest question you've been asked or asked lately? (Yeah, and this one doesn't count, PITA)