Good old transportation analogies, we can make up anything with them.

Fedora/Mint is a free (electric) bike. Arch is free system to order bike parts and instruction how to assembly whole one yourself for free. Gentoo is an automatic parts molding machine. Linux From Scratch is a book about bikes. Windows is a Segway.

"Bikes are only free if you don't value you time" "Segway 10 is much easier to use, buttons are more intuitive than manual steering and if you know this Konami code you can ride without an account too!"