Would it be legal to include a quote from a person in a game? Example: I make a game of some sort and decide to include a quote from Bruce Lee at some point, not verbal audio just written somewhere.

Fair Use =P

By general rule, if the quote is small enough (say one or two sentences), it falls under fair use and thereby is legal. There are exceptions (e.g. if what you quote is the whole point for buying the book from where it was quoted or something =P), but I don't think that's the quote you're looking for.

EDIT: and I'd make clear from who you're quoting by the way (e.g. saying that it's from Bruce Lee inside the game in your case).

Thanks, if anyone else can confirm this just in case that would be wonderful but I think I'm going to go along with it since it isn't something that would break anything if I couldn't have it in the game.

Fair use is an affirmative defense. This means that you have to go to court to use that defense. If you can afford to go to court, by all means, rely on fair use. However, when an author uses a line from a popular song in her book, her publisher will typically require that she get permission from the song's publisher prior to sending the book to print.

The law of fair use is extremely flexible and unpredictable-- in almost every instance the existence of a fair use is a case by case determination and therefore relying on something like fair use always creates a risk.

As a result professionals in every entertainment industry invest no small amount of time to perfect clearance for any project. This includes sending out notification for a use under "fair use" or requesting permission to use a piece of artwork, a noteworthy quote, etc. from any work already protected under copyright.

If it isn't game breaking and you don't want to go through the trouble of writing a letter requesting permission or notification of the use of the quote under fair use to the rights holder for the script/film, you should consider removing the quote.