I probably shouldn't admit to *any* of these, but here goes.
Two scenes in "The Color Purple". The first when all the white people are gathered around Oprah's character taunting her and slinging racial slurs, and the second when the two sisters are reunited at the end, old women running across fields of flowers crying each others' names. Give me a hitch in my throat every time. It's doing it now...
Scary moment has to be that scene in "Silence of the Lambs" when Clarice is in the home of the killer, in the dark, groping around with her free hand and holding the gun in her other. Eeewwww...
And, goofily enough, the beginning of the animated "Tarzan" tears me up each and everytime. I can't watch it. Fire, death, rebirth, mother love...it's just too intense for me.
And lastly (for now) the very end of "The Usual Suspects" when all the pieces are tied so neatly up while Kevin Spacey walks so calmly out of the police station, dropping a piece of his act with each step that he takes until the very end when he's the full embodiment of Kaiser Sosa, standing tall and proud and smugly evil. Love it!