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Negative tip
Who's the mugger now?
Interface designers make mistakes, but I don't think they'd make the mistake of allowing a negative sign anywhere on it. You could try for integer overflow, but that's gonna be really bad if you guess wrong.
One time I did come across one of these that popped the whole iPad keyboard up, I tried to enter a negative number and clearly the programers were extra dumb because it managed to crash the whole POS and force a reboot
ETA: cashier thought it was hilarious, store owner got so mad he banned me from the store "for life"
banned me from the store “for life”
Awesome! I hope you refused to honor it unless he put a poster on the front door with a picture of you and a ghostbusters-style "no" sign around it.