I have a light fixture that came with a mounting bracket and some screws. When I went to screw the bracket into the ceiling fixture box, it looks like the box's holes are too big. Not only do the screws slide right through the hole, but bigger screws won't fit through the bracket holes.
Here is a picture of the box.
Here is a picture of the screw that is supposed to go into the box. You can't tell, but it's way too small!