When I was a kid, I discovered a glitch in Final Fantasy where if you wiggled the cartridge in the NES at the intro screen just right, it would garble the text but keep the game running.

You could then get to the character creation screen and all the characters would be garbled graphics. One was a broomstick and if you made 4 of that character you would start out being able to deal 400+ damage right from the start of the game after you created the party and did a soft reset to fix the graphics.

Did it with a cartridge purchased in the UK if region matters.

Don't know how useful it can be now to everyone, but figured I'd let people know that it exists since I believe I'm the first and maybe only person to discover it.