I wouldn't wear them as t-shirts, but these two Threadless submissions gave me a laugh. Links are to the artists' sites. You can vote for the designs by clicking on the voting widgets.
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"Thomas Edison" by
Let's Make Art.
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"Apology Accepted" by Thomas De Santis
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*Previously:
Wheelchair with a flamethrower.
*
Buy children's books featuring wheelchairs at Amazon.