I believe this comes from the episode where Jim, Dwight and Michael drive to the Utica branch to steal a copy machine? I came across it while looking for Michael Richard’s pictures and didn’t want to waste it.
If you ever see a guy with a mustache like Jim’s, just step away. He’s there to kill you.
Michael Richards, famous for his long stint as Kramer on Seinfeld and his extremely racist rant at the Laugh Factory, was part of the “just watchable” Airheads. He sported a nice mustache and spent most of the movie in an air duct.