I heard one time...
...to test a guy's character have him walk your dog around the block.
...to test an egg to know if its raw, spin the egg on a flat surface.
If it wobbles, it's raw.
If it spins well, it's hard boiled.
And to add to these true tests
If its a great fabric it makes a great yoyo!
What would you expect from Yoyomama...