My top pick is going to shock some folks: Fight Club If you've never seen it, give it a chance, it was marketed badly and is nothing what you expect from the ads. Weird but edgy and surprising, in my book I almost categorize it as Science Fiction, a good "what if" type of movie. Please note this is NOT a kids film, adult content is intense. Alien/Aliens and Raiders of the Lost Ark are of course good picks too. And the prequels, PotC I, X Men I/II, Firefly/Serenity, Lost, are also good movies to curl up infront of the A/C for. And although it's being run over and over, Superman I is still pretty neat to see.