I won't spoil it, Ben, but Jason kills a guy wearing the hockey mask and adopts it as his own in I believe the beginning of the 4th movie. It's been a long time, honestly, but yes, watching him own souls as Pillowhead isn't quite as menacing.

This was a very fun discussion!

I think the first horror movie to have shots from the killer's POV might be Peeping Tom (1959). I haven't seen it, but it's about a guy who films his victims while he murders them. Apparently the movie was so controversial it ruined the career of its director, Michael Powell.

Also, Mario Bava's A Bay of Blood (aka Twitch of the Death Nerve) (1971) is credited as being a big influence on Friday the 13th. It features a double-impaling like the one in the 2nd Friday film. It's actually a pretty terrible movie, but critics have praised it for its imaginatively gory and violent murder sequences.

Black Christmas (1975) shows the killer's POV several times. He climbs into the attic window of the sorority house, and it's a very creepy (if clumsily done) effect.

And of course, Halloween (1978) does it a lot. Pauline Kael commented that you get so many POV shots in Halloween that it seems as though everyone has his own camera.

There are actually two scene in Friday 2 that scare the hell out of me every time. The first is when the lone survivor (Amy Steel) is trapped in a bathroom, and you don't know if Jason will come from the window or through the door. And the second is when she's in the Volkswagon and Jason slashes through the roof with a pitchfork. I think part 2 is slightly better than part 1.

BTW, Amy Steel appears in April Fool's Day (1986), which is a great spoof of slasher movies. It also has Biff (Thomas F. Wilson) from Back to the Future in it.