I picked up a can of compressed air at Walmart so I could clean out my AC's filter. It's a restricted item so the cashier had to approve it.
Cashier: "are you 18?"
Me: "no"
>he reaches for the OK button on the screen<
Cashier: "ok then..... wait, what?"
Me: "I passed 18 a log time ago."
Cashier: "oh, haha."
Me: "You asked the wrong question."
The old lady cross from us totally got it.