I'm pretty sure its this guy. I saw him at the Halifax International Busker Festival two years ago. He was pretty good and amaxing with a yoyo. I gave him a quarter and he whipped it off some one's ear with a yoyo.
His name is John Higby. I've seen him perform in Boston at Quincy Market. He's also known there as the yo yo guy. He uses the Coker in his show. Riding a circle inside the crowd while yo yoing (is that a word).
-- One on one - Geezer Unicyclists Of America
"However, like the jet pilot, if the Coker rider tries to turn too fast, he/she could black out." -Memphis Mud