Entry location: Online Game Mode
When online against another player, Hit ENTER button. Then type 999. Afterwards hit ENTER. Make sure you have the sound on. It will play a jingle that goes:
"This is... arches 3!
This is arches 3ee!
This is... arches 3!
This... is arches 3!"
This will likely annoy the crap out of other players. Also, there are other number combinations from 001-012 (Make sure to have the 0s or it won't work), I wont say what they are... figure them out on you're own.
Submitted by Mr.Mini Moose jr.