Frosties Prank Call
If you're from the UK, then you should get this.
Basically, a radio station phoned up an electrical shop under the guise of wanting to buy 14 plasma tvs, and kept putting the guy on hold, but the twist is the On Hold music was the music from the Frosties Advert.
Oh, and if you've never seen the Frosties Advert, you're very lucky. But just in case you want to see it, you can see it
here.