The Bootstrap Paradox or the Causal Loop is a situation wherein the origin of some information does not exist. It is a widely used concept and has been shown in movies like “Interstellar” and “predestination”.
This paradox was once shown in our favorite childhood cartoon “Doraemon”. An episode of the series was based on a cartoonist who was being pressurized by his publishers to complete the next edition of a comic book series, but, he was out of ideas. Nobita, one of the main characters of the cartoon was eagerly waiting for the next edition of the comic book series. When it comes to his knowledge that the cartoonist had ran out of ideas and that he had to wait much longer, the desperate Nobita traveled to the future to get one of the published comic for the cartoonist in the present. The cartoonist in the present then copies the comic written by his future-self, without knowing the consequences of his actions. This created a causal loop where there is no origin to the text in the comic. It was never the work of anyone, it has no source, and it just exists.
Similarly, in the movie Interstellar, the wormhole through which Cooper and his team go on an interstellar expedition, the Tesseract in the Black Hole and the falling of books from the bookshelf where all were bound to their future self. Even the movie Predestination illustrates a similar concept in which the origin of existence of the protagonist ceases to exist.