Yes, that WAS a juggling unicyclist you saw along the Alki Trail this afternoon – along with a group of other unicyclists, bicyclists, other cyclists, and/or jugglers:

They got together for what they call the “Alki Classic” – biking and barbecuing. They headed out from a spot along Harbor Avenue near the West Seattle Bridge, and planned to follow the shore all the way to Lincoln Park.

ADDED 10:36 PM: Video as the cyclists went by – including Nate, the juggling unicyclist: