Check it out!
http://www.thinkgeek.com/tshirts-apparel/xkcd/dabb/
Also this one.
http://www.thinkgeek.com/tshirts-apparel/xkcd/dadc/
http://www.thinkgeek.com/tshirts-apparel/xkcd/dabb/
Also this one.
http://www.thinkgeek.com/tshirts-apparel/xkcd/dadc/
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