Fishing Movies - The Grass is Greener

I had to write about this movie that I watched tonight. Cary Grant plays an Englishman who's wife falls for another man. In pure British style, he promptly invites him over to the his house for the weekend, takes him fly fishing while directing him towards the deepest parts of the river, and then challenges him to a duel. When his wife asks him why he decided to fight for her he remarked, "Because if you left I would miss sleeping with you and there would be no one to send the Christmas cards." I hope Zug doesn't get any ideas from this one!