I hate to break it to you Threadless, but once again you've printed a stolen design. This shirt is based on a popular internet video by Charlie Schmidt.
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He owns the intelectual property rights to Cool Cat. He also sells Cool Cat tshirts on his Zazzle site.
See HIS shirts
Charlie Schmidt is one of the finest performance artists of our generation and it's rather sad that Threadless would print this and not give him a good chunk of the profits considering they are making money off his idea and images of his cat.