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Tear Jerker: E.T. the Extra-Terrestrial
This Troper hasn't cried at the ending since she was a kid, no, what reduces her to a sobbing pitiful and pathetic MESS is when the scientists are trying to give CPR to E.T. All you want to do is jump in the TV and push them away.
Spielberg deliberately filmed the scene so it looks like they're hurting ET rather than trying to save him, since that's what any kid like Elliot would naturally think.
Then there's Elliott screaming for the scientists to leave E.T. alone... then just crying when it looks like he's actually dead...
Michael, a mature teenager, curling up among the stuffed animals in the closet to cope with his overwhelming concern for his younger brother.
The ending, as the Extra-Terrestrial, about to depart, says goodbye to Elliot.
E.T.: I'll...be...right...here.
And the way they both say "Ouch".
Also E.T. dying on the operating table while Eliot gets better. "Stay... "