Episode V The Empire Strikes Back
Luke Skywalker (Mark Hamill) has finally come face-to-face with his mortal enemy, Darth Vader, and the two proceed to engage in an epic duel through the innards of Cloud City. The duel ends when Vader slices off the young Jedi's hand and drops some particularly heavy familial science on the lad.
We look back at Forces that made us cheer -- and wince. WARNING: MASSIVE SPOILERS AHEAD