I remember a Yo-Yo demonstration when I was in school in the '70s, I must have been been 9 or 10. Duncan probably sent guys to schools all over the country to show us the kinds of tricks we'd be able to do if we just bought a bunch of yoyos and got to work practicing. The guy we saw that day at the assembly did the same kinds of tricks I saw before and since, probably the same tricks people did when the damn thing was invented. I figured the yoyo was fully explored as a source of entertainment.
Apparently not. This guy's like the Jordan of yoyoing. Still pretty boring, but as interesting as yoyoing gets.
From Double Viking.