I've got 2600+ songs in my iTunes library, and I usually listen on shuffle. To make things a little more interesting, I ripped a CD of sound effects. Now, I can randomly get 20-50 seconds of gems like
"Shower Sequence", "Angry Mob (Small)" and "Crazy Doings". There's also
"Spanish Men On Horseback Chasing Indians", although they might be Portuguese and I'd never know it.
My favorite, though, is on another of the three volumes of the set: "Nuclear Blast (simulated)".
And a shiny new dime to whoever knows the title of this entry...