This turned out rather well, if I do say so myself. It was my first attempt at stenciling.
This should irritate a great number of math people.
Don't get it? Remember that episode of The Simpsons where Lisa invents a spray that stops bullies from attacking nerds? When she is on stage with Professor Frink, he quiets down the crowd of scientists by exclaiming "pi is exactly three!" That should probably give you the gist of it.