As a kid, everyone played a classic game called "the floor is lava." There was only one rule, and it was pretty simple: don't touch the floor, or you're dead.
As we got older and more mature, we stopped climbing all over the living room furniture as part of this weird thought experiment. But there remained certain things we wanted to avoid at all costs—and some others that just never seemed within reach. That's how "the floor is" meme was born. Simply say what the floor is and post an image of someone not touching it. Here's how it's done: