In a skillet over medium heat, brown the ground beef and onion. Drain off the grease.
Stir in the garlic powder, mustard, ketchup, and brown sugar. Mix thoroughly. Reduce heat, and simmer for 30 minutes. Season to taste with salt and pepper.
Pile your sloppy joe on the bun & top with a piece of cheese that you've cut the edge into points. Let the cheese 'teeth' hang off the side a little. Top with the other half of the bun. Stick a toothpick into 2 pimento stuffed olives and insert them into the sandwich, making the monster's eyes. Serve & enjoy!