Because one of them is going to win, and it sure as hell ain't gonna be the fat guy in the diaper.
What can we say about TeeFury that hasn't already been said? That it's the single best one-day-only T-shirt site on the 'net? (True.) That it consistently gives us stuff we didn't know we needed, stuff like the awesome R2-D2 Haynes manual t-shirt? (Also true.) Or that it's a font of creativity and limited-run goodness that makes our skin go all tingly? (Again, true.)
You know you want it. You know you need it. Buy it now, and quickly, because it's only available for twenty-four hours. Nine bucks plus shipping. You're welcome.