Navy Seals use them to signal their subs for pick-up
In a pinch MacGiver can turn one into a satelite dish...
They make great holliday candy plates...
If you have a table with one short leg they're a god send.
A little wobble right side up. Big wobble turn 'em over.
Cat food works in the small ones. Dog chow in the big ones.
They're ideal as a patch for that rusted out floorpan in your Mustang II, Pinto or Chevy Vega...
The smooth edges are perfectly suited for scraping poo off your sneakers...
And they keep a lot of automated engraving machines busy...