Mine comes out to 16, but that's counting Marooned, which I only saw as a Mystery Science Theater episode, and A Bridge Too Far, which I saw as a young kid and remember nothing of, except the fact that I saw it. Then there's a few I've seen bits of but never watched the whole thing, which I didn't count.

I think Gene's trying to set a record for most John Grisham movies (2 done, 1 in the can).

My score was 17. I included movies that I've seen most, but not all of. Like "The Package" and "The Poseidon Adventure".

I didn't realize there were so many I had seen.
It appears he's a favorite of John Grisham, having been in 2 already with another on the way.