The ending of the first “Pirates of the Carribean” also has Johnny Depp, once again captain of the Black Pearl, at the head of the ship, staring out into the ocean; in a husky voice, he murmurs “Now… bring me that horizon.” This was adlibbed.

A small but memorable moment from “Catch Me if You Can” comes from a scene in which father (Christopher Walken) and son (Leonardo DiCaprio) Frank Sr. and Frank Jr. are sitted together at a fancy restaurant. Frank’s father, who recently divorced his mother, discusses with his son how he’d been trying to win her back and rebuild the family. Suddenly, when repeating to his son the oft-told story of how the two originally met, he gets choked up and begins to weep. This was completely unscripted (he was supposed to say the line straight), and stunned the heck out of everybody watching.