Grip the front of the crown of the hat and remove it from the head. Hold the hat vertically and spin it outwards while pushing the hat up with the finger tips. After one spin catch the hat in an outside grip.
With a bit of extra practice you can do this with two or three spins or do it in "slow motion".
Headstop Cascade - A three hat juggling pattern where each hat is thrown to the head.
This is a series of Throw To Heads, alternating hands, but immediately after you make the throw, you have to take off the hat on your head with the throwing hand.