Cinema Paradiso - the end, when he's watching the reel. *sniff*
I'll second that one, Elizabeth. Cinema Paradiso is one of my favourite movies, too.
In
A Room With a View: the stolen kiss in the field.
In The Blues Brothers: When they're in the car, under a bridge, ready to skedaddle--the lines about "...we've got a (full?) tank of gas, a half pack of cigarettes...It's dark. And we're wearing sunglasses. Hit it."
Also in the Blues Brothers: Wagner's Ride of the Valkyries is playing, when the two nazis go flying off the unfinished road ramp, soaring into the air, then downward. One turns to the other and says "I've always loved you."
The scene in Animal House, when Bluto's going down the stairs as Stephen Bishop is playing and singing a folk tune. Bluto grabs the folkie's guitar and smashes it to pieces...then sheepishly says, "Sorry."
The taunting *French* soldiers scene in Monty Python and the Holy Grail.
Also in the Holy Grail, the scenes where the puny, effeminate prince tries to break into song..."I'd rather...juuuuuust....sssssing!" "Oh no, you don't!"
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I know there are more, but can't think of them at the moment.