Multiple endings refer to a case in entertainment where the story could end in different ways.
The Choose Your Own Adventure series.
The 1983 strip Cliff Hanger.
Ayn Rand's 1934 play Night of January 16th allowed the audience to affect the ending by acting as the "Jury" and voting the defendant "innocent" or "guilty".
The 1985 musical The Mystery of Edwin Drood.
Dario Fo's 1970 play, Accidental Death of an Anarchist.
The long-running play "Shear Madness" has multiple, audience-selected endings
DVDs may include an alternate ending as a special feature. These are usually not considered canon.
Films which include multiple endings within the main cut of the film:
Clue
Wayne's World and its sequel, Wayne's World 2
Sliding Doors
Run Lola Run
Harikrishnans
Dragon's Lair and Space Ace
The fifth season finale of the Rooster Teeth web-series, Red vs. Blue