From the shop The Art Menagerie:

Left handed Humor on tshirts, stickers, magnets, hats, and more. Is there any connection between left handed people and creative genius? Some of history’s most creative minds have been left handed.
Sizes: S,M,L,XL,2XL.

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Being left handed definately does not mean that you are not right.  In fact, it may mean that you are always right.  Enjoy a bit of humor this International Left Hander’s Day with this I May be Left Handed But I’m Always Right t-shirt.