You guys have mentioned all good ones so far.

I'll add "Dr. Jekyll & Mr. Hyde with Spencer Tracey. I was just a kid when I saw that movie. I went to bed that night, forgot to take my glasses off, but was too scared to jump out of bed to put them on the dresser. My dad came in during the night and removed them fore me. It's been almost as many years since I've seen it though.

I too liked The Day The Earth Stood Still, and although kind of corny, "The Blob" (Steve McQueen version) is one of my favorites. I remember watching The Creature from The Black Lagoon and enjoying that one as well.

The Vampire movies and Werewolf movies are probably my favorite "monster" type movies I guess. Although Frankenstein is pretty cool too.
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TIS

"Mankind must put an end to war before war puts an end to mankind. War will exist until that distant day when the conscientious objector enjoys the same reputation and prestige that the warrior does today." JFK

"War is over, if you want it" - John Lennon