“Why stupid questions have you heard someone ask (or asked yourself)?”
It has been said that there are no stupid questions. Having worked several years in the retail business at a few different stores, I can tell you that this is simply not true.
I used to have some of the same customers who would come in every single week, sometimes multiple times, and ask the same question(s) every time – questions which always received the exact same answer. A repeated question can surely become a stupid one!