Here is mine
I like it because it's this image that first got me interested in horror movies, seeing this poster in the movie rental place when I was 6 or so years old scared me to death. It was from then on where I started watching movies like Friday the 13th and Nightmare on elm street.
Oh, by the way I'm new to this community but I'm a true Jason Fanatic, owning every movie currently availiable, having several "toys" that were created by Both paramount and new-line. And I even have a hockey mask used in part 3! (well not the exact hockey mask, but it's a replica prop I bought on E-bay.