Here are a couple of my favorite Jokes/Riddles related to PI.  I’m sure some of you have your own favorites – and if you submit them, I’ll add ’em to the list:
1.  What formula does the pirate (PI-rate?) use to calculate the area of a circle?

A:  Pi AAURRGGGH squared!

2.  My own favorite response to “How many digits of Pi do you have memorized?”:

“Well, all of them.  Now, I’m just working on the order.”