I got this idea from a fellow teacher in my building to start collecting math and teacher humor! I loved it so much I decided to start a wall in my room that I could look at and get a laugh when I needed it!
Some of these I can not stop laughing when I look at them!
So far the best one that has stumped my students is this one! They have asked me so many times why the pi symbol has sunglasses and a mustache!