you sure you read this? i don't think you'd sound so stupid if you did.
Bill Murray in Zombieland is a cameo. Lance Armstrong in Dodgeball is a cameo. the whole idea of a cameo is that it's a role that doesn't affect the plot significantly and the appearance alludes to the person in real life or another role they played in another movie.
Did you even bother to the read the link you posted, dumb fukken idiot? Quit trying to sound smart. Just stop, please.
This was taken directly from the link you posted:
A cameo can establish a character as being important without having much screen time. Examples of such cameos are Sean Connery in Robin Hood: Prince of Thieves, Ted Danson in Saving Private Ryan, or George Clooney in The Thin Red Line.
So either you're just a flat out idiot or didn't bother to read your own citation. And the part I quoted plays in perfectly to the other idiotic statement you said about Fishburn's character having no significance.