Was traveling with a friend. I got auto-upgraded. Asked if he minded. We both wanted to sleep, he couldn't have cared less. I took it.

Dated a woman, we went to Mexico together for a long weekend. I got upgraded, she didn't. I didn't take it, we both had the emergency exit row.

Funny postscript to that - I sat with her in the EER until the other person whose seat I was in came on board. He was with his wife. I asked him, "Sir, I don't know if you'd like to switch, but I have a first class ticket here, but I'd rather sit with my girlfriend in Coach. If it's ok with you, I'll give either you or your wife my first class ticket, and one of you can sit up front, and I'll take that seat, so I can sit next to my girlfriend."

Husband: "Thanks, but we don't want to be split up."
Wife: <Grabbing ticket out of my hand> "The hell we don't. See you in NYC, sweetie." <bolts to first>

I hate to think that I'm responsible for the downward spiral of their marriage, but... :-)