In no particular order:
Alec Baldwin's scene in Glengarry Glen Ross.
The "I drink your milkshake!" scene in There Will Be Blood. Including the bowling alley part.
When Gandalf leads Eomer and his riders into Helm's Deep in The Two Towers.
Theoden's speech and the Last Ride of the Rohirim in The Return of the King.
Roy Batty's requiem in Blade Runner. (aka tears in rain soliloquy
Kevin Spacey telling Brad Pitt he "envies" him in Se7en.
the final sword duel in Sanjuro http://www.imdb.com/title/tt0056443/?ref_=fn_al_tt_1
James Gandolfini and patricia Arquette's fight in True Romance
All of Raising Arizona.
Nigel showing Marty his guitars in This Is Spinal Tap ("goes to 11")
Every other scene in Spinal Tap
the love scene in The Thomas Crown Affair (1999)(I was not a fan of Renee Russo until this)
Tom Seleck & Alan rickman's duel at the end of Quigley Down Under.
Sgt Elias being left behind in Platoon.
Marge with Mike Yanagita in Fargo
the Big Shoe Dance in Pee Wee's Big Adventure
The final at bat in The Natural
when the telegram boy comes to the locker room with a death notice in League of Their Own
Maude throwing her ring into the lake in Harry & Maude
Denzel getting lashes in Glory
opening scene of Fear and Loathing in Las Vegas ("We were somewhere around Barstown on the edge of the desert, when the drugs began to take hold.")
Jennifer Connelly on the horse in Career Opportunities. (omg, there was never a more gorgeous human being to walk the earth)
Eddy Murphy crossing the street in Bowfinger
"what is best in life?" in Conan the Barbarian