Ah, another xkcd reader.
I have a funny story that happened this morning. For reference, I'm an officer in the military, and my squadron does a Tae Kwon Do workout once a month for PT. Just basic kicks and punches, no sparring or anything, but if you show up late, you have to do 10 pushups for each minute you're late.
Anyway, after the workout, I'm walking into the gym (the workout was in a building on the other side of base), and I see a fellow officer from my squadron about to leave. So I ask her why she wasn't at PT, and she says she didn't know where this morning's session was held at. Since she's relatively new to the squadron, I decided to have a little fun
Me: So since you weren't at TKD with us, that means you owe us pushups.
Her: Huh?
Me: Yep. Since you didn't show up, and we worked out for 67 minutes, that's...hm, carry the one...670 pushups you owe us.
Her: *eyes the size of dinner plates and face pales to two shades above bone white*
Me: *realizes she thinks I'm serious* Kidding! I was kidding!
Her: :club: *swats me with her cap*