The guys at FilmCrewShirts have been doing some sterling work coming up with a whole range of comedy film crew clothing emblazoned with phrases regularly heard on the set. I suggested this one 
Any other ideas?
Updates from May, 2009
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Language of film sets t-shirts
Ed Moore
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One grenade
Ed Moore
I like this little bit of set politics, from a new blog I’ve been following, Polyblogimous (via the always-wonderful Blood, Sweat & Tedium).
Recently, I discussed using radios on set. We also have some hand signals we employ when using the radio would be a problem. One, that I learned early was when I was standing near the Craft Service table with all the other P.A.’s on a commercial. The 2nd A.D. waved to get all of our attention and then, with a really dramatic scowl, he made a motion like a slow-pitch softball pitcher lobbing the ball. This sign, I discovered, meant one grenade, which was shorthand for, “You assholes don’t belong all in the same place at the same time where one grenade could wipe out the entire production staff in one fell swoop.”
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Researcher hiding FAIL
Ed Moore
We spotted some poor researcher trying desperately to hide on the BBC’s live election coverage…