What's the biggest dick move you've ever done to a kid and felt no remorse afterwards?

While working at a Subway one night this kid comes in and orders a footlong. The entire time I'm trying to take his order he mumbles, sighs, looks/walks away, keeps saying "I dunno", he must of been very nervous. When it comes time to pay he smiles at me nervously and says he doesn't have enough. He's close but off by about 40 cents. So I said no problem little buddy let me just ring that in as a six inch. He beams triumphantly from my act of kindness! But alas, instead of not worrying about 40 cents, I snatch the sandwich back, split it in two, hand him half the sub with his change and toss the other half in the trash. Felt very satisfying.