Triple doggy dare ya

Larry just walked over to me with his coffee mug in hand and a childish grin on his face.

L: I forgot to rinse out my mug last night. If you drink what's left, I'll give you $50.

Me: DONE.

L: No, I can't let you! You'll get sick!

Me: Larry, it's two sips of cold black coffee. It's fine.

L: What? Well, if it's not gross, bet is off.

Me: I lied, it's totally gross. Bet is ON. [I grab the mug and finish the coffee.]

L: Well done... well done... [He hands me his debit card and slowly walks away.]