Irrational Pi Humor Pinback Button
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Large image of PI, saying gobbldygook. In the corner, a face says "Don't Mind Him, He's Irrational." It's funny to a mathematician, trust me! Great gift for math majors, math teachers and the math inclined. Celebrate Pi Day with a t-shirt that makes a humorous statement! Customize this design with added text if you like. From Scarebaby Design, backed by the Zazzle guarantee.