You know you want to!
Strip down to your (almost) skivvies and run in the cold for a charity (not to mention the beer and snacks before hand at Shenanigan's in Downtown Chi).
The event's organizer is Type 1, her brother is also type 1 so you know the cause is close to their heart (and mine). Last year they had around 150 runners and this year they're hoping to double that so all of you crazy runners out there get even more crazy and take it off (well not all of it) for Diabetes!
Details @ http://www.chicagosantaspeedorun.com/
and on Facebook.