for math: what about a large image of PI on a shirt with the image actually being very small numbers of pi calculated to a large number? see here
for CS: Practice Safe Hex & Avoid Computer Viruses Today! on a shirt
for math: 2 + 2 = 5 , see here
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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