well... everyone talks about these things like ERMAGHERD THE NEW CONCEPT... crap like this has been around forever. Slinkies, those little magnetic balls.... all that brickabrack crap people put on their desks in their office to fuss with when they are bored. This is just the 'new thing'.... hell, you can drop $125 on one that is made of titanium and has extremely expensive NASA-going-to-Jupiter grade bearings made of exotic composites.
It's silly, but it got a bunch of bearings in it and bearings are cool. Plus you can do crazy stuff like this, so people are doing crazy stuff like this and putting it on youtube. This yutz is using compressed air cans and doing it while camping in the woods for some silly reason, but the REAL lunatics are using air compressors.