Seven Samurai/Awesome

Arguably the greatest Samurai movie ever. Also:

Kikuchiyo's killing spree in the last battle.
When Kambei mentions how beneficial it would be to take one of the bandits' guns. Kyuuzou takes it upon himself to go at it alone, a sure suicide for almost anyone else who would have volunteered, and runs off into the night. He returns at dawn, hands the musket over with one word (futari: two men [killed]) and goes to sit alone, proving his badassery once again.
An out of universe example: Actor Seiji Miyaguchi who played Kyuuzou had never handled a sword in his life. Through clever camera angles and brilliant editing, Kurosawa made him appear as the greatest swordsman in the film.
Kyuuzou's sparring match with another nameless samurai. The battle appears to be a draw, and the other samurai laughs about this. Kyuuzou calmly states that it was not a draw, and that he won. The other samurai becomes very angry, and challenges his to a real duel. Kyuuzou several times begs him not to, but the other insists. Kyuuzou DID win the previous duel, and he wins this one too.
"I can't kill a lot with just one sword!"
Kambei's practical method of rescuing a child hostage during his character's introduction. It impresses the young Katsushirou, coming from a prominent samurai family, to choose that old ronin as a worthy mentor.
When the villagers are first wary of the newly arrived samurai, the alarm bell in town goes off and all the villagers immediately beg the samurai for help. Kambei leads the others to the bell to find Kikuchiyo ringing it: he's doing it to show the villagers how desperate they really are for protection, and calls them on their hypocrisy in not accepting the samurai quick enough.