I'm waiting in line at the customer service counter. The guy in front of me has a shopping cart with 2 different kinds of coffee machines in them.
He goes up to the counter, and has this exchange with the girl:
Counter girl: "Yes, sir, can I help you?"
Guy in line: "I'd like to return a coffeemaker."
Counter girl: "Is something wrong with it?"
Guy in line: "No, I'd just gotten the GE by mistake, and I meant to get the Mr. Coffee"
Counter girl: "Okay. Can I see your receipt?"
Guy in line: "I don't have one. I haven't bought it."
Counter girl: "Excuse me?"
Guy in line: "I haven't paid for it yet. I'd just put the GE in my cart, then realized it was the wrong kind and got the Mr. Coffee. So now I need to return the GE."
Counter girl (looking shocked): "Um, if you haven't paid for it, sir, you can just put it back on the shelf when that happens."
Guy in line: "Oh." (pause). "Uh, what do I do now?"
Counter girl: (who's visibly trying not to laugh) "Just give me the GE and I'll take care of it, then take the Mr. Coffee over to check out".
He wandered off. I got up to the counter and said "I'm not with him, I swear".
She was laughing so hard she had to go to the break room, and someone else came over to help me.