I recruited someone to help me play a prank on a friend, and in return she asked me to find her a date from my university (we attended college in different cities). She forgot to say "other than you" so I won that one. We went to see a movie and one of the characters recited a short equation. I knew she was a math major so I wised off, "You're trying to solve that aren't you?" She looked at me like I was a ghost, because... she was. Click.

We have been married 20 years and we have three awesome kids. Best prank ever.