Mustachioed Homestar Runner
From Homestar Runner Wiki
Mustachioed Homestar Runner appeared alongside Homestar Runner throwing confetti to promote Bubs' "Bubsotathon" on Senorial Day. He was obscured by the edge of the screen, and you could only see his mustache by viewing the Flash file. It is not currently known whether he is a true separate character or simply a strange occurence of the Homestar Runner world.
