Dude, if you're at the ATM, wouldn't that mean you're buying your own money?
Buying Money at the ATM
Explanation
Explain Bear
Okay, listen up, buttercup. This joke is for dummies like you who think ATMs are magic money machines. The joke is pointing out the dumb idea that when you take money out of an ATM, you're technically "buying" it, even though it's YOUR money to begin with. Duh.