I know there's probably TONS of Pac-Man creepypastas out there, but this is something I just thought about recently.
If you've ever played Pac-Man, there may be a few things you haven't noticed. I can point those out for you though. First of all, notice how the game never makes it clear where Pac-Man is. Yes he's in a maze full of Pac-Dots and ghosts, but that's all the game tells you. But also notice that this particular place is completely dark and Pac-Man has no eyes; he must rely on sense alone, using only his mouth to get around. This can explain why the background of the maze is black, because it is so dark. Also, what if Pac-Man isn't who everybody says he is? What if he's not really a yellow puck-shaped creature that goes around eating dots and fruit? Notice how the only thing these dots and fruit do is give you more points, while when you eat a Power Pellet the ghosts turn blue and you can eat them. Also notice how these ghosts NEVER seem to go away. Sure, he scares them off by eating them, but they always return to the Ghost House in the middle of the screen and come back.
You want to know what I think? I think that Pac-Man is really the soul of a child with an eating disorder, who died from eating too much and getting a heart attack, and is now trapped in purgatory, constantly starving and having to eat to stay alive. His only source of food is these dots, Power Pellets and fruits, while all this time he's doing this he's being chased by four demons who were sent to torture him, and the only way to fend them off is to eat one of those Power Pellets and devour them, temporarily sending the demon's spirits away, only to have them come back and repeat his torture. He must endure them for eternity, the only thing taking it off his mind being the sustenence of delicious fruit being presented to him.
And when he gets it all done, it just goes on, and on and on...