Ok.... found it...
But please be warned RIGHT NOW! THis is not for the easily offended... or kiddies...
and if you're at work... put the Headphones on!!

http://www.limmy.com/playthings/xylophone/

try the buttons in different orders..
Might be fun to phone someone you intensely dislike and press away at the buttons??
Jam away!!!

p.s... if it's deemed to be a bit excessive, please feel free to delete this! Don't want to upset anyone...

Ewan