Niagara
'Let me tell you something. You're young. You're in love. Well, I'll give you a warning. Don't let it get out of hand like those Falls out there. Up above it... Did you ever see the river up above the Falls? It's calm and easy. If you throw in a log it just floats around. Let it move a little further down and it gets going fast. It hits some rocks and in a minute it's in the lower rapids and nothing in the world, including God himself, I suppose, can keep it from going over the edge. It just goes.'
Joseph Cotten, no filme de Henry Hathaway, Niagara, Twentieth Century Fox Film Corporation, 1960.