A guy I worked with was asking about a project I was working on with him, and once we got all those questions answered he was like, "Hey, would you like to get in on this little bet me and some of the fellas have going?"
I shrugged and asked him what it was all about, and he said there were a bunch of dudes at the company who were doing a weight loss challenge -- Ante up $20 bucks, weigh in on a neutral site scale, and then at the end of the month whoever has lost the most takes all the money in the kitty.
Monster did something like this a while back (did we ever find out how you did with that?) so maybe he can offer some pointers, but for the time being -- perhaps the challenge of making some cabbage off the rest of these dudes can be just the type of motivation I need to get things rolling.
At the same time, I can't tell you just how nice a feeling it was to have someone come up to you and say,
"Hey, you're fat. Wanna play a game?"