There is one other film...

Rating: Null/10 (3 January 2008)

Well, actually, this is not the first time a movie like this was made. A Swedish movie was made in 2006, namely, 'Frostbiten (English title: Frostbite)'. This movie didn't receive a lot of credit though, maybe that is why you didn't know of it. Go figure, Swedish cross breed of a teen slasher, and a blood sucker comedy.
I found Frostbite to be quite amusing, I had some great laughs, I haven't seen the English translation yet, but I don't think it has lost it's humor.
Enjoyed reading your review, I will catch this flick on the screen soon, I hope!
Thank you.