This may be my favoritest ever Pi Day T-shirt, designed by the admin over at 10-Minute Math. I admit it’s not very mathy, but I’ve always enjoyed word play, and I love key lime.
The design won a Reflection T-shirt Company contest and is now available to pre-order for only $8.99 (plus shipping). [Company seems to have gone out of business? Can’t find their website…]
Unfortunately, it won’t be available in time for this Friday’s class.
Denise Gaskins' Let's Play Math 
I am loving the Key Lime Pi shirt! Thanks for sharing!
That’s a great one but this one has to be my favorite!
http://tinyurl.com/d9py2v
That’s a fun one, too — made me chuckle.