1970's cultural artifact

Lileks linked to this; I didn't recognize the name, and was growing bored waiting to recognize something other than a guy who looked like an interchangeable actor I had seen on dozens of TV cop shows I watched as a kid.

And then we get to the skit that made him famous, albeit briefly, where he provides the soundtrack and the "magic tricks". I had completely forgotten about this, but watching it again makes me remember when this was "hot". I can still visualize Mark imitating these moves. I didn't stick around to read about the "why I am now in a wheelchair" or why the B-list stars were gushing over him. Maybe another time.

dah-dah-DAH-dah, dah-dah, dah-DAH!