I could never pick a favorite, I have so many. However, I could watch Lord of the Rings, over and over, and never get sick or want to fast forward certain parts like I do with some movies. I rarely get to watch new movies but I have seen some good ones. I'll give a quick list:

Out Cold
Homeward Bound
Alaska...I think is what its called
Harry Potter movies
Pirates of the Carribean
Uh...I can't think right now but there are so many more!