Have hours of fun!
This is part of a Web page for a really interesting conference. There's added incentive (is "added incentive" redundant?) to attend: a $50 prize will be awarded to the person who comes up with the "best original joke involving a triangle, square, or Platonic solid." (Think I'm joking? Check out their space.) So, a triangle, a square, and a Platonic solid walk into a bar . . . .