How do you all safeguard your keys?

This is for a bit of fun, but I was curious what are some of the weirdest ways you or someone you know safeguards their keys? For a crypto trader, their keys are probably the most important thing they know, so we must try and keep them safe. I know that some people just write it down somewhere but that’s boring. What are some absolutely insane ways you know that people do? I know some people do tattoo their keys, so they don’t lose ’em and according to MetaMask, some extreme crypto traders carve their keys into metal to make sure it is 100% safe. There are certainly some weird crypto traders out there so I would be very interested in finding out.