Here are clips from the last episode of Howdy Doody in 1960.
If you haven't seen it before, this is the first time heretofore silent clown Clarabell spoke on camera. What does he say? If you don't already know, I won't spoil the surprise. (It happens around 4:30 in the clip).
There is another surprise after the credits - a few of the original NBC bumpers, including the one for the show that replaced Howdy.