This movie was filmed in the late 70's or early 80's. Its a parody of slasher movies were the killer wears galoshes and makes heavy breathing noises. Its set in a high school. One scene I can remember is the killer is walking down a long flight of stairs and keeps stepping in gum, they only show the legs on down of the killer until the end. And throughout the movie when someone says something that could connect them to a killing an arrow points to them and the words "suspect" pop up, Can anyone remember this movie or even post a link to somewhere that I may be able to find out the name.