If you can do a bit of computer progamming, it can be fun to work out Pi using random numbers and Pythagorus:)

To initialise, set up two counter variables (let's call them inside and outside) and then, for each iteration in the main loop, generate two random numbers between 0 and 1. Sum their squares and then take the square root. If the answer is >=1 add one to outside and if its < 1 add one to inside. Finally, display the ratio between inside and outside.

Of course, you really have to do a _lot_ of interations, but like I said, it's just for fun:)