Product of the Day: Jewel Yoyo from HumphreyLine

Fact: After the success of the original Rocky and popularity of Stallone's "yo" catchphrase, he quickly set to working on a sequel, originally called "Yo Yo." After playing with HumphreyLine's Jewel Yoyo, Sly realized the movie would never be as fun and changed the name at the last minute.

You can't disprove it.