I've been trying to remember the name of a horror movie I used to watch early in my youth.

I remember certain scenes but not the whole movie nor the plot.

I remember the Principle of a school (might not be the principle but it was at a school) jumping on a trampoline and then someone taking a flag pole and sticking it through the trampoline from under it and the guy landing on it.

Also, there was a scene where this hot chick throws a football at a guy and the thing turns into a screw of some sort and it just drills the guy a huge hole in his chest.

God, I can't remember the name.