One thing I have noticed while working at 7-Eleven. People's IQ's tend to drop a good 50 points the minute they walk in the door. I have several examples:
Me: Would you like a bag for all that?
Customer: (slows visibly with what they were doing, be it counting money or arranging items or punching buttons on the pinpad, finally coming to a complete halt as they stand there motionless and staring off into space) Uh...
Customer: No. (usually they resume, albeit very slowly, whatever they were doing) NO WAIT, YES. I want a bag.
Me: (bagging items) Do you want a receipt?
(repeat above steps, mix, and serve. It ain't frikin rocket science)
That's one. Here's another:
Customer: (hands me a hundred dollar bill to pay for a cigarillo, which costs 1.07)
Me: I'm sorry, but I can't break a hundred dollar bill.
Me: You see, we keep very little cash in the register. It's for security reasons.
Customer: This is all I have.
Me: I'm sorry, but there is a sign on the door stating that we only keep 30 dollars in the register, so breaking a one hundred dollar bill is usually out of the question, unless you are making at least a 50 dollar purchase. If you want, you can wait for ten minutes while the safe cycles. (by this time I'm getting a little aggravated)
Customer: (usually stands there, at a complete loss as to what they should do) You guys took one the other day.
Me: I'm sorry, but most convenience stores keep very little cash in the register. The largest bill I can accept easily is a 20. Would you like to wait for the safe to cycle? It'll be about 10 minutes.
Customer: I can't wait 10 minutes.
Me: I'm sorry then, you'll either have to wait for the safe to cycle or let me wait on the next customer.
Customer: (walks out in a huff)
This happens at least once a day, usually more. Now, I would NEVER walk into a convenience store with a hundred dollar bill. It's fucking retarded. Especially to pay for an item that costs one dollar.
Customer: (hands me a 20 dollar bill) I need 20 in gas. (turns around and walks out)
Me: Which pump?
Customer: (stops with the door half way open) Uh... (long pause, usually at least 5-10 seconds) That car over there (motions towards the pumps) on the other side. Pump... I don't know the pump number. (sometimes there are four cars at the pumps, and merely gesturing and saying 'the other side' gives me a 50/50 chance of choosing the correct pump)
Me: Which car is it? There are two trucks, a black Mustang, and a blue Honda Civic.
Customer: Oh, oh. It's the white truck.
Me: Oh, I thought you said a car. Which white truck, the one on the left or the one on the right?
Customer: The one on the right.
Now it may sound like I'm exaggerating, but I'm not. Shit like this happens on a daily basis.