Apollo 13
The Right Stuff
All 3 Godfathers
Star Wars Eps. 3-6 (#2, I flip a coin. I won't watch more than 10 mins. of #1 at a sitting).
Star Trek -- all except #1 and I get coin-flippy on #5, 9 and 10.
Shawshank
Hoosiers
Bull Durham
Field of Dreams
Eight Men Out
Jerry Maguire
Blazing Saddles
Animal House
Ferris Bueller
WarGames (1985)
Batman Begins, The Dark Knight. TDKR I usually channel-flip in and out.
Spider-Man 2 (#1 and #4 are passable; #3 is a shutoff).
Any Rocky except #5
Ali
The Hurricane
The Hunt for Red October (however, that's the ONLY Jack Ryan film I like at all)
Finding Forrester
Miracle (the USA Hockey movie)
That Thing You Do!
Contact
Beverly Hills Cop 1 & 2. BHC3 is an instant-shutoff.
Lethal Weapon 2 & 4. For some reason I don't like 1&3 very much.
2001: A Space Odyssey
Only The Lonely
Coming to America
Almost Famous
Dazed and Confused
Armageddon
Independence Day
Master and Commander
Tin Cup
A Beautiful Mind
The Grapes of Wrath
On The Beach (1959)
Children of Men
The Paper
My Cousin Vinny
Ocean's 11 (2001) or 12; not the Sinatra original or O13.
October Sky
Clerks 1 & 2, but pretty much nothing else Kevin Smith has ever stuck his thumbs into.
Gas Pump Girls. A 1979 magnum opus featuring Huntz Hall of the Bowery Boys as a befuddled gas station owner. The movie concerns a bunch of guys working at a failing gas station in the late 1970s and a bunch of awesomely stacked babes joining the crew and working in halter tops (or less) and performing various duties around the 'lube rack' and the station becoming a booming success. By strange coincidence I worked in gas stations in the late 1970s.
Special Mention for very very brief scenes: Lost In Translation and Unfaithful.

(LIT I will usually sit and watch the rest of the flick; once the 2-3 world-class minutes of Unfaithful are over, it's click time.)