I have seen "May" about five times or so by now, and it is still as good as the first time I saw it. I found it by sheer random luck in the local secondhand DVD store. I bought it without knowing anything about it or the people starring in it.
What makes "May" unique is the absurdly entertaining story, but also the entire cast. Especially Angela Bettis who performed the role of May to perfection. She was so well-cast for this role. Anna Farris also really performed quite well, and it was nice to see her out of the usual comedy genre that she is in.
The story, shortly summarized, is about a socially inadequate loner named May, who falls in love with a guy she sees on the street, and she tries desperately to get his attention and affection by all means necessary.
"May" is both a story and character driven movie, and it is the type of story that creeps in under your skin and will stick with you. It has a good combination of drama, character acting, thrills and blood. Yes, there is blood!
I can strongly recommend that you sit down to watch "May" if you haven't already seen it. It is one of those movies that is a surprise of a movie.