3. Star Wars (1977)
The Film: George Lucas launches a sneak attack on arty, miserable 1970s American cinema using a ragtag army of WWII dogfights, samurai movie costumes and cowboy characters.
Why It's Rewatchable: As kids, to memorise every last plot point to re-enact with the toys. Nowadays, because it's practically a reflex.
If You Only Rewatch One Scene: "Use the Force, Luke." Those rapid-fire moments as the Death Star nears its countdown, Vader has Skywalker in his sights and a dead Jedi's ghost is telling Luke to switch off his targeting computer.