Pi Day is an annual fun day when people employ a homophone connection and celebrate the day with pie. Irrational? It has taken me by surprise a few times. The most notable was when a popular breakfast restaurant publicized that they were honoring Pi Day. My family begrudgingly put on the Sweetie-Pi and Cow-Pi t-shirts I had purchased at an NCTM conference and wore them to the restaurant. Not a single employee of the restaurant even noticed we were dressed for the occasion (I had to ask a waitress to notice them). Still, I am a fan of Pi Day. In 2015, in fact, I had quite an irrational party, in which we all toasted with champagne at 9:26. (If you are wondering why, consider that Pi is infinite and look at its digits beyond 3.14) But wouldn’t it be great if we could celebrate a little bit of the value of Pi and other mathematical ideas? At the very least, can we take on some of the irrational ideas that people hold about today’s mathematics and replace them with more rational ideas befitting the 21^{st} century? Here are my top three irrational ideas I regularly hear from lay people and educators, and my suggestion for what is a more rational perspective.