The other day at work a nice old lady (See, I don't hate all old people!) approached me and said, "I have a rather dumb question to ask."
I emotionally braced myself for yet another soul-crushingly stupid inquiry, but her question - while certainly not brilliant - was so far from dumb that three days later I can't even remember what she asked. I assured her that the question was perfectly acceptable, gave her an answer, and she went on her way to buy old people stuff.
A few minutes later she was at the checkout loudly apologizing for her "dumb" question. I walked up to her and said, "Ma'am, let me put this in perspective. The name of this store includes the word 'liquor' but I have been asked on more than one occasion if we sell liquor here. Your question was not dumb."
"Goodness, 'Do you sell liquor here?' That IS a dumb question," she said as she left.
After experiencing momentary happiness for using an example of typical moronic behavior to make an old woman feel better about herself, I quickly went back to wishing I had learned a trade.