Have you ever wondered where you can get 130 MP3 files of the various sounds people make when they pass gas? No? Burping? No? Okay, I'm not really interested in that either, but I bet someone out there is.
On the other hand, I'm interested in animal noises to use as ringtones. Really interested. ZapSplat is a web site that has free sound effects for just about anything you could ever want for any purpose - An audio play, a podcast, background noises for a slide show, music, what ever.
Before you can download the MP3s you have to sign up for a basic account (use one of your junk emails!), but once you do, it's yours for the taking. It downloads easily and the site is safe. (I ran it through Google Safe Browsing and it came out clean.)