25 pull ups is very decent... but i wouldn't call that ridiculously good (i can do ~20s). Anyways, if you were good at it, you could probably win some bar bets. I had a shop teacher in high school who use to brag that he could do 30 chin ups, and would challenge students. Well one year, this one student was a gymnist, and while the shop teacher did 30, he was well above 50+ before he came down.
Personally for me though, i can do smoke rings. I use to be good enough that i could shoot out one big one, then shoot a small one through the ring. I pretty much stopped smoking though... although when i do social smoke, i still have a habit of doing smoke rings (hell, it's what got me smoking).