Last time I filled my car with gas, the pump didn't shut off automatically and I ended up overfilling my tank. There was a small puddle underneath my car that reminded me of a story from when I was an undergraduate and spent my Saturdays working at a gas station.
One particular Saturday, my boss' son was having a bad day. It had been one customer after another complaining about this or that. He was a little frazzled. Then one woman came in demanding that we refund her for a gallon of gas. The pump hadn't shut off, and "at least a gallon" had spilled all over the bay.
Normally, he would've just reached in the register and handed her the two dollars. Instead, he said, "Let's go out and have a look."
There was a small puddle of gas, but it was maybe $0.25 worth at the most. He told her that, but she kept insisting that it was much more.
Finally he snapped. He said, "Look Lady, you want to see what a gallon of gas looks like? THIS is what a gallon of gas looks like!"
He then proceeded to pump an entire gallon onto the concrete.
It's probably my favorite* gas station story ever.
*Narrowly edging out the time that I called a customer a butthole, he tried to get me fired for "cursing" at him, then my boss called him worse.