Black friday? More like BROWN FRIDAY! Don’t forget to give that special geek in your life a special gift that screams MATH NERD. Head to the Brown Sharpie store at CafePress.

And remember, kids–as long as there are mathematicians, the existence of really bad math puns can be taken for granted. It would be folly to expect uniqueness, though. Viva really bad jokes!

Finally, if you have a strong stomach, here’s what I did on my Thanksgiving break (warning: photo contains blood and stitches): Shoulda bought a slap-chop…