In the mod review Zombie Nation, a guitar always played after a quest was completed and another one was added. Al hated the guitar and said: "You know what? I'll just take it." So he started singing lyrics to the guitar.
There's lone zombie, Walking up here.
Shoot him in the face, And his, body disappeared.
There's a monster in here, His name is, Jerry so.
He knows a thing about boots, Everybody told.
Hello Mr. Chris, This song is over.