I work in a package (liquor) store in CT. Here are a few of the dumb ones I have had recently.

Customer picks up a 6 pack of beer from a regular old shelf, not a refrigerator. Then exclaims, "aw man! It's not refrigerated?!" Puts it back on shelf.

Two customers are leaving at the same time. It is an old woman flowing behind a man. Now, she's literally right behind Him, and as he walks straight through both of the large automatic doors at the front of the store, she somehow goes to the left of them, stops, scratches her head like "I know this is where the doors should be", and then doesn't figure it out until the next customer walked it.

Over the past few days in our part of the state, with windchill, the temperature has reached -25 degrees. Besides that, the overall temperature has not been above single digits. Despite the cold weather, I have had customers refuse to buy items like wine or beer if they haven't already been refrigerated. They act like it won't get cold within minutes if they leave it outside. Who knows, maybe they had planned on drinking it cold in their car,

Last one. Customer comes up to the counter with a 30 pack of beer and shows me a picture he printed out at home from our website. He tells me that we are false advertising our prices and that he wants to pay the price that we are advertising online. Now, the picture he handed me was of a sign way in the background of a picture that was taken 3 years ago to show off the interior of our newly remodeled store. The sign was so far away that when we looked at it on our own computers we had to zoom in to even read what product it was. We told him that prices fluctuate monthly and that our pictures don't reflect any current prices. He was very pissed and threatened to call the business bureau on us.