Here's why it's considered a top candidate:
* Frequent repetition: Gollum, the character who utters the phrase, says it *repeatedly* throughout the trilogy, making it a memorable and iconic part of the film.
* Memorable: The line is short, impactful, and directly associated with Gollum's character, making it easily recognizable.
* Popularity: The films are highly popular, and the line has been widely quoted and parodied in popular culture.
However, it's important to note that there's no official record or scientific analysis to definitively declare "My precious" as the absolute most repeated line. There are many other contenders, and the answer might depend on the specific criteria used to define "repetition."