It's rude to assume a cashier short-changed you on purpose.
Biff bought something at the store, and he realized he was 78 cents short.
Biff wants his money back.
Biff asks the cashier about the missing money.
"Biff runs up to the cashier and says ""way to short change me, butthead!""."
The cashier notices the mistake and gives Biff the missing money.
Biff does get his money back but not before arguing with the cashier and many other employees.