You can bet on it ... in theory

Maybe not actual propositions you can bet on at BetUS.com, but ones they've posted for the NCAA Tournament:

==10/1: Odds that you win your office pool
==2/1: Odds that you watch a game during work hours
==10/1: Odds that your boss catches you watching the games on your computer
==500/1: Odds that you get every game correct in your bracket

Odds on a buzzer beating victory:
==4/1: In first round
==50/1: In Sweet 16
==100/1: In Elite Eight
==250/1: In Final Four
==500/1: National title game