And never even got any residuals from Chaplin.
He only looked like Alex Trebek.
I recall someone where they said he or she was almost asked to join the actors union since they were on so many shows.
When the script for that episode was written, they wanted to cast Johnny Cash in the role. So the joke would have been Mulder saying the Man in Black he met was Johnny Cash.
Probably my favorite was Bob Barker in Happy Gilmore where he fights Adam Sandler.