In interviews, Dustin Hoffman says he ad-libbed the now famous line, "I'm walking here! I'm walking here!" as "Ratso" Rizzo in Midnight Cowboy.
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Some actors are also known for their ability or tendency to ad-lib, such as Peter Falk (of the series Columbo), who would ad-lib such mannerisms as absent-mindedness while in character.
The ad libitum parts and sections of the melody line in "I Need a Miracle" and "Toca's Miracle" including harmonies are exclusively the creation of Coco, who gave the song its iconic stamp.