I don't want to go as far as to call her stupid, but... my mom! I took her to the grocery store the other day to buy some stuff - and she was simply in a hurry to get everything. She walked quickly past people cutting in very close to them, people were stepping back. There were 'one way' signs across aisle and she was just going back and forth... and by the cashier she went past the glass screen thingy (by the conveyor) to speak with the cashier. Needless to say we had a very intense talk that day, I don't think she will repeat but god did that piss me off.