People who pull into a busy gas station and act like they've never filled the car/bike before. Fumble around looking for the credit card, stare at the pump for awhile. Slowly go through the menus. etc. I'm usually buttoning up and leaving before some of these morons have a gallon into the vehicle.
Or people that pay with cash so they park the car at the pump, walk in and pay, come back out, pump the gas, leave the car again, stand in line, buy snacks/lottery tickets/bathroom, come back to the car and then leave 20 minutes after they pull in.
Tele-sales people phoning you randomly to try and sell all types of sh 1 t to you, and expect you to be friendly and understanding when you say "no thanks", but they keep pushing the envelope.
I fixed that by buying a portable phone system that has the ability to block up to 250 calls. I block any number that I don't recognize or they don't leave a message.