I’m a beginner in terms of trick list, but have enjoyed having one around since my glowinthedark Imperial in the 80’s. About 15 years ago, I noticed my new dentist had a display case of yo’s in his office, including some cool aluminum ones and a photograph of an astronaut yo-ing. He noticed my interest and put a black and red wooden butterfly shaped yo in my hand that read “Brush and Yo Daily” in gold. He’d just gotten a bunch of those in to celebrate an anniversary of his dental practice. I finally figured out my dentist was that Tom Kuhn LOL. He always asks me to show him a trick and has taken to bringing my young son along as well, giving him his own wooden butterfly and double looped the string to aid in his learning. Truly a great guy (and dentist!).