they made some big tops

[Jack]

and called them fidget spinners @-@

https://www.youtube.com/watch?v=l6G2mBG9cp4

[the Earl of Whirl]

Hmm.  Very interesting.

[Jeremy McCreary]

Incredible! I have to have one of those! Immediately!

[studio42]

OK, who here thinks they could boomerang that?

Not I!

[ta0]

That's big! At 38 kg (84 lb) I wouldn't try to boomerang it, either! 

They were sensible enough to take good precautions when trying to stand on them, but they weren't successful. 
I wonder if they understood precession and that they had to lean at 90 degrees (clockwise for a counter-clockwise spin) from the direction it slopes down.. Probably not. Not intuitive to do (same as balancing a top) and would take a little practice. In addition, the tip should had been more rounded. They should learn from Daffy:



Jeremy will do better with his. 

[Jeremy McCreary]

In addition, the tip should had been more rounded. They should learn from Daffy:



Jeremy will do better with his. 

Having watched every Daffy Duck cartoon ever made many times over as a kid, I can tell you that it's almost never a good idea to learn anything from this duck. However, he's clearly onto something here.

Living on a lake with lots of ducks year round, I can also tell you that Daffy's IQ is below average but not by much.

The makers of this 3,800 g weighted turntable should have consulted the LEGO engineers who came up with the Spinjitzu warriors not just standing but battling on 32 g weighted turntables at 0:33 below. Note the very broad tips, just as you suggested.

https://www.youtube.com/watch?v=l4mq6iiMV7E

I wonder if they understood precession and that they had to lean at 90 degrees (clockwise for a counter-clockwise spin) from the direction it slopes down.. Probably not. Not intuitive to do (same as balancing a top) and would take a little practice.

Really makes you appreciate the great skill of those Spinjitzu warriors.