I've got just over 20 responses in comment form and in emails. Thanks everybody who has responded so far.
For those who haven't yet responded, what are you waiting for? A written invitation?
Well, okay then.
Dear blog reader,
You are cordially invited to participate in the Great Slasher Research Project of 2010. Step 1 of the two step project involves crowd sourcing a working definition of the a slasher film. To help, leave a comment, either here or in the original post, that lists (in no particular order) the elements you believe make a film a slasher film. Don't worry about the answers of others - in fact, don't even read the other responses until you've contributed your own. And don't spend to much time crafting the perfect response. We're looking for a list like so:
1. Something something
3. Stuff that is there
4. Nothing that shouldn't be there
5. You know
On the 20th, I'll quit taking suggestions and present those elements on which their was the greatest consensus.
Dress code is casual. You may bring guests.
There's your written invite. No more excuses.