A friend of mine described this film to me as one of the weirdest things he’s ever seen- he can’t remember a title, or a lot of the plot details, but he remembers enough that I think you guys could figure it out!
It is set in what is possibly a gas station, or diner. A man enters at some point- who is essentially set up as the “main” character (though my friend seems to recall him dying fairly early on). At some point monsters suddenly show up and start killing everyone.
Later on there is also sex between the monsters, and babies pop out and begin attacking as well.
He recalls a female character possibly surviving.
To note, we are certain it isn’t Legion he’s recalling in some way.