Fast Times at Ridgemont High - Got Change for a Nickel?
At the checkout counter Jennifer Jason Leigh is serving a customer whose bill comes to X dollars (can't remember dollar amt, but irrelevant) & 10 cents. She says his change is 5 cents, but unless he gave her a 15-cent coin, there's no way he could've gotten 5 cents change without first paying 5 cents too much. She gives him back his own nickel!
The customer clearly gives Stacey a single bill and a single coin (looks like the size of a quarter). Stacey says to the customer "One ten and you get five cents back".
I think I noticed this one the first time I saw the movie and it bugged me everytime since. I too never thought to think the guy paid in change. However, I think this was a slip up in that I doubt the script called for the guy to pay for food with change. I think if anything, the dialogue was improvised for that little moment and the 3 quarters and 4 dimes formula just happened to bail out the end result. If that makes any sense...