this movie?
http://www.imdb.com/title/tt0318081/
It came on TV at the hotel we were staying at outside of Yosemite two summers ago, I watched it with my dad, and maybe some more of my family. It was one of the worst movies I've ever seen. I remember reading the Bradbury short story it is "based" on (I use the term very loosely) in 9th grade English. It's not a super-low budget movie, but the special effects are pretty abysmal. The plot is full of holes and weird bits, if I recall. For some reason I just thought of this again today, not sure why.