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• The Spinning Top and Yo-Yo Museum Convention 
• YouTube Video of what you could see during competition at the convention

As the Blood, Sweat and Tears song says, "what goes up must come down."

Unless you're a yo-yo.

And in Burlington, there's celebrating all things that go down, then must come up, and all the funky-looking tricks that happen in between.

"You can make them do all kinds of stuff that seem to defy physics, amazing little sights," said Judith Schulz, the founder and curator of the Spinning Top and Yo-Yo Museum in Burlington.

This week brings the Yo-Yo Convention, where Judth's showing off all things yo-yo.

"It's a huge exhibition of 1,000 yo-yo's, memorabilia, posters, all kinds of good stuff to do with yo-yo's."

Including some rare ones, as Judith describes, "made of silver, yo-yo's with propellers, yo-yo's that light up and flicker, and then there's rare yo-yo's, some of the early Duncan's."

Then Friday comes special events with a gizzmo workshop, before the real yo-yo's show off their yo-yo skills with various trick shows on Saturday.

"People are doing one particular trick that's fairly difficult, and it's usually the tiebreaker in most contests, and everybody starts at the same time doing this particular movement with the yo-yo, and we'll see who lasts the longest," states Judith.

And then comes Sunday, when the world's best yo-yo-ers go at it in competition, doing the craziest tricks, like juggling.

"You take the yo-yo's and you juggle them," explains Judith.

"Sometimes people are doing one yo-yo trick up and down, and then they throw it into the juggling."

In some cases, people can simultaneously hula hoop and yo-yo. That's a lot tougher than chewing gum and rubbing your stomach at the same time.

Then, there's barrel rolls, flipovers, mounting tricks, man-on-a-trapeze, boingy-boingy.

Boingy-boingy???

"The yo-yo bounces back and forth in this triangle of string, as if this string was elastic," says Judith. "So it's like boing, boing, boing."

"It's amazing what people can think of to do with a yo-yo."