Are there stupid questions?

I used to believe that the only stupid question was one that wasn't asked.  I have changed my mind.  Years ago when my twins were born the nurse in the hospital asked what they were.  "A boy and a girl".  She then asked if they were identical.  "Uh, no.  They are a boy and a girl".  It took a while but she clued in and felt very embarrassed.  I waved it off as something funny and maybe she was having a blond day. 
Then the other night I took Matthew into the corner store with me to get a pop.  The clerk was nice and wanted to see him and of course noticed his cleft.  We chatted for a bit about it and then it came.  Another stupid question, "Did you fall down when you were pregnant?"  Really??  I would think that if I had fallen down it would have been me with the split lip, not the baby I was carrying.  I looked at her for a while hoping that she wasn't serious, but she was.  I politely said no and paid for my pop.  Once in the car all I could do was shake my head then laugh.