Most of the time when I listen to my iPod I just leave it on shuffle mode, as kind of my own personal radio station. I can listen for hours and never hear a bad song! It's fun listening to Beastie Boys segue into Tom Petty into Prince into For Squirrels into a mashup I found on Hype Machine. But I still get the biggest kick out of when between songs my iPod picks a mini-track from They Might Be Giants a992 album Apollo 18. In addition to the great songs on the CD are 21 tracks called "fingertips" that are each about 8 or 9 seconds long that can only be described as "random". I can't explain them, just preview the tracks on Amazon and you'll get what I mean.
I was thinking about TMBG this morning and visited their website. They have three hysterical ringtones available for download on the homepage for $1.50 each. The best is "Call Connected Thru The NSA," but "Ring Ring" is also awesome. Even if you don't buy them, they are worth listening to online. If you do decide to buy them you're guaranteed to have the funniest ringtones in the office.