A public marriage proposal to your beloved is always a bad idea, and doing it in an arena of any sort is almost a guaranteed way to get a refusal. (Another great way? The airport proposal!) Don't believe me? Check out these videos of a couple of schmoes who thought halftime at a basketball game would be the perfect place to propose marriage.
She gets points for a graceful refusal. I love the buzzer that goes off as she's saying no.
This one literally ran off the court. Maybe the ring was from Zales?
Best/worst part? The local news covered it!