Two things about “any key”.

Firstly, when the computer asks you to hit any key to start, it means “Hit the space bar.” Really. You want the “any” key you’re hitting to be a safe one, and the space bar answers nicely. If you’re pressed, the up-down-sideways navigation arrows work fine too.

Secondly, due to a bunch of playful, fun-loving computer techs, and possibly something Homer Simpson said, the “Any” key is also known as the big red button on the back of your computer. This is your last resort key, as in “I got so frustrated I pressed the Any Key“, or your malicious humour outlet: “Yes, sir, simply press the Any Key, it will solve your computer problems.“