At 4:44 in the clip above, Merlin the magician, as a squirrel, Contact Juggling with an acorn. It’s from the 1963 Disney classic, The Sword in the Stone.
If you still believe that Micheal Moschen “invented Contact Juggling” in the 1980’s. Don’t worry, in this movie, Merlin is a time traveling magician, so he probably learned from Moschen, then traveled back in time to 1963 to appear in the film ;p.
Thanks to Lawrens Godon and Paponda for the clue.