Speaking of the funniest sketches ever done on television, a top contender would be "This Is Your Story," a take-off on the TV show, This Is Your Life, as fractured by Sid Caesar, Carl Reiner and Howie Morris on Your Show of Shows. If you have Real Player installed on your computer, you can view the entire thing online at this link. See why the people who don't recognize Howie as Ernest T. Bass all recognize him as Uncle Goopy.
And you can view the second-funniest sketch from that show — "The German General" — by clicking on this link. And the third-funniest ("The Clock") is at this link.
And here's a page with three clip montages from The Tonight Show Starring Johnny Carson. The first one includes the complete "Copper Clanger Caper" starring Jack Webb and Johnny. A classic bit of self-parody by Mr. Webb.