I was just looking at my profile and just looked up and saw the http://theboyofages.newgrounds.com/ and looked at my name there, and said to myself "What if I put some random name there?" So I did, and got a few unused alt that others have made and have abandoned long ago. Hes a small list of the accounts I've found alone and unused.
http://dipshit.newgrounds.com/
http://honkey.newgrounds.com/
http://losser.newgrounds.com/
http://jackoffasaurus.newgrounds.com/
lol that last one was a leap of faith and i was watching that ep. of South Park when I thought of it ok.
Just put some random name and see if you find a user with it. Its kinda funny seeing how dumb a name can get on NG.
P.S. don't make a alt just so you can say "Heres one that really funny!" The 08 part will give it away.
Oh and before you think these are my alts look at the dates of the registration I was here way after any of them.