You could try buy a sandwhich with shiny yellow rock but nobody will take it.

Pass some OpenDimes around. That was a kooky way to use Bitcoin but I kinda liked it.

Actually your grandfather did pay with gold. The US circulated gold coins until 1933, and Britain until 1931. That's exactly why the "gold never worked" claim is backwards: coins worked for 2,500 years, then governments banned them because honest money made deficit spending impossible.