Marshall: Okay, you know what? Prove it. Take my number and run in my place. I will bet you 50 bucks you don't even finish the race.
Barney: 50 bucks? Gee, Grandpa, if I win, maybe I can buy myself an ice-cream cone. Make it $10,000.
Marshall: You have a gambling problem, you'll bet me $50.
Barney: Fine, then no bet. Okay, $50.