The Bootstrap Paradox is a theoretical paradox which occurs when an object or piece of information sent back in time becomes trapped within an infinite cause-effect loop in which the item no longer has a discernible point of origin, and is said to be "uncaused" or "self-created".
It is also known as an Ontological Paradox, in reference to ontology, a branch of metaphysics dealing with the study of being and existence. -Astronomy Trek
Scene in movie
- "Guess you guys aren't ready for that yet, but your kids are gonna love it."
- —Marty after playing "Johnny B. Goode"
If you remember, the movie shows Marvin Berry talking to Chuck Berry. During the call, Marvin says "You know that new sound you're lookin' for? Well, listen to this!" After that he holds up the phone so Chuck can hear Marty's playing. From that whole scene, history repeats itself. Marty plays "Johnny B. Goode", Chuck listens to him play, Chuck records the song, and Marty know what song to play and the dance. This, of course, is how the Bootstrap Paradox is formed.
Video of "Johnny B. Goode": https://www.youtube.com/watch?v=S1i5coU-0_Q
If you want to see another example of the Bootstrap Paradox there is one in Doctor Who, where the Fifth Doctor (Peter Davison) crosses timelines with the Tenth Doctor (David Tennant). This mini-episode is called Time Crash.Doctor Who Bootstrap Paradox: https://www.youtube.com/watch?v=YXpHuRYjPJw