I used this to mess with a few guildies on april fools day, pretty funny when they thought my 70 got sent back to level 1
/script DEFAULT_CHAT_FRAME:AddMessage("Congratulations, you have reached level 1!", 1.0,1.0, 0)
to change the levels simply change the "you have reached level --!"
SS of what it looks like
http://img406.imageshack.us/my.php?image=omfgno2yg5.jpg
for added effect to mess with guildies/friends create a level 1 of the class you play as, and mail the gear it's wearing to your main.
[you]lol
EDIT: A way a person can figure out that this is fake is to use the armory, but most people aren't going to think of that when the time comes, but funny none the less
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