Not a one-liner but I was present when a young college guy bet a Final Four official 20 bucks on a rule question and won. Unfortunately he tried to press his luck with a double or nothing and lost.

Edit: Actually I do have a one-liner. I asked a D1 college guy at my first ever camp what his worst call was. He replied "that's a kindergarten question". Needless to say I now keep my mouth shut.