This movie is filmed something like the MTV show FEAR, where it's all from cameras set up and stuff.

All I remember is that all these people are in a barn or something, staying there for some reason. Right at the end of the movie, I think in the barn, it's dark and you see at the last second, the face of this... I guess it's like a giant bat or monster. And that's it.

Any idea?

Jeepers Creepers 2?

No, it was something similar to My Little Eye. From what I recall, most was filmed from hand held cameras or security cameras.

I know the last scene takes place in a barn. What looks like a giant bat comes out of the dark at the camera and the scene cuts to credits.

I figured it out. It's 2005, The Roost.