Right—Roys Scheider (Chief Brody) in Jaws. He was spreading chum on the water when the shark rose, and for a few seconds, they eyeballed each other. The shark disappeared under the waves and Brody walked backward into the cabin, still looking at where the shark had last been, and said to Quint, "We're gonna need a bigger boat."

Richard Dreyfus (Hooper) had a funny bit that didn't involve a spoken line. He and Quint (Robert Shaw) didn't get along and were often trying to one-up each other. Quint is sitting with a can of beer in his hand and Hooper is standing near him with a Styrofoam coffee cup in his hand. Quint swigs that last of his beer and crushes the can with one hand. "CRUNCH!" Hooper glares at him and crushes the Styrofoam cup. "crinkle".   

Hilarious!

Don Firth