We've all done it: registered in a road race under an assumed name.
My personal favorites:
Mike Nutz (doesn't seem funny, but say it outloud and picture them announcing it at an awards cerimony)
Peter Surewood (proper spelling of the last name is key)
Josphat Kiptaurus (or some such name, is greeted with suspicion when announced at the awards and a skinny white boy walks up)
Ronaldo, Ronaldino, Pele (no last name, just a first name, they love that at the awards)
Jim Jimmers
Steve Ovett
What are some of your favorite fake names?