I started reading Stephen Wolfram's "A New Kind of Science" a few days ago, and when I got to page 130, I thought, "hey, those look like audio".
(run the program like
a.out c > c.wav)
The basic idea of these sequences is similar to fibonacci numbers, except instead of looking a fixed amount back, they look back a variable amount based on previous values. perhaps more sequences like this sound interesting!
Also, I've been programming for about 10 years now, and I think this is the first time I've written a C program that's compiled and run and did (at least close enough to) what I wanted it to do on the first try.