Alrighty... here we go again! lol.
The fan was Chucky's death in Child's Play 3, or, if you count lawnmower blades, some poor sap gets a face full of them in Leprechaun.....2? I think...
Grenade is difficult, but it's also Child's Play 3, except Whitehurst jumped on it, body first.
The punching through and throwing, I don't know that it's ever been punched all the way through, but throwing people (out windows, into electrical boxes, into trees, etc.) is a hallmark of the Friday the 13th series. It happens to so many unsuspecting (but entirely deserving) teenage morons.
The toilet was one of the Sleepaway Camp movies... probably the second, but it was more of an outhouse than an actual toilet.
Eating themselves was Nightmare on Elm Street 4, it must've been traumatizing to see Greta die around the dinner table.
The vertical cut was done with a machete in Friday the 13th Part 3.
A Blender blade probably wouldn't cause much damage. There's a lot of safety features in place, although the cup of a blender is usually heavy grade glass....
A bat on a chain wouldn't be as effective as just a bat. The chain would ruin the dynamics of what makes swinging a baseball bat so powerful, unless you're really toying with the laws of physics.
I'm not totally sure how you'd trap someone in an oven. Possibly a walk-in kiln, but not your conventional oven unless they're already dead.
I do like the baseball... hmmm.... I wonder how fast you'd have to get a pitching machine going to do that, though...
Something along the lines of Child's Play 3 (again) with the head of the military school?
http://www.youtube.com/watch?v=jHqiTiu1YwE