I once tore open a watermelon using a car key and my bare hands. Everything is possible if you want a watermelon.

But watermelong should be enjoyed on the shell. Sprinkled with salt.

Knowing Japan it probably isn't.

What's with you saltfags? Srop ruining good watermelon!
I've met several people who do that, and it creeps me out.
They're all from America. Is it an American custom?

north american, i believe. cantaloupe, watermelon. my wife does it

I'm from America and I'm hearing about it for the first time. Sounds disgusting.