An otherwise ordinary or innocuous event has disastrous consequences and quickstarts the entire story or a huge plot development
1) The first part of JoJo's Bizarre Adventure starts with the Joestar Family getting into a carriage crash after they decide to go out in the rain, with them getting robbed by Dario Brando. After the patriarch, George Joestar wakes up, he misreads the situation and thinks that Dario was trying to help him, with him becoming incredibly grateful for it. This event is what would eventually cause George Joestar to adopt Dario's despicable and psychopathic son, Dio after his death, leading to Dio's generational conflict against Jonathan and his descendants, culminating in the entire universe being reset centuries later.
2) In the final season of Breaking Bad, Hank takes a shit in Walter White's home and grabs a book that was laying over the toilet to read while he's at it. Turns out the book was the same one that Gale Boetticher had gifted Walt a couple seasons ago, leading to him finally finding out that his brother-in-law was Heisenberg the whole time.
3) In the second half of 20th Century Boys, a lazy highschool student named Koizumi gets an assignment to make a presentation about any japanese historical event or figure of her choice, which she really doesn't want to do. After her teacher declines her last minute decision to make one on Hitler, she randomly flips open a history book and lands on the page for the Bloody New Year's Eve of the year 2000, hastily picking that as the theme of her assignment. This eventually causes her to fall down into the rabbit hole and discovering that that whole event had been an inside job orchestrated by the Friendship Democratic Party and that the so-called "terrorists" led by Kenji Endo were falsely accused and set up by them, with this newfound knowledge making Koizumi a potential enemy of the state, all because she was too lazy to do her homework.
4) Falling Down starts with our protagonist, William Foster, stuck in a traffic jam while he's on his way to his estranged daughter's birthday party, leading to him exiting his car in the middle of the traffic and walk to his ex-wife's home. This kickstarts the whole events of the movie as the police starts going after him, all the while he becomes progressively more unhinged, collecting several weapons and doing a series of terroristic acts in an attempt to go back to his "good old days".
5) Any episode of Regular Show (especially the earlier seasons) basically falls into this trope, to the point it's become kind of a meme at this point. Usually the formula is that Mordecai and Rigby have to do some mundane task (usually under Benson's orders) which escalates into something wacky and batshit insane in the climax. In the pilot episode, for example, they both decide to play rock paper scissors to see who would be keeping a chair that was about to be thrown away, but after tying the game 100 times in a row they accidentally summon an ancient demon that begins destroying the park unless they actually get a winner in the game.
2) In the final season of Breaking Bad, Hank takes a shit in Walter White's home and grabs a book that was laying over the toilet to read while he's at it. Turns out the book was the same one that Gale Boetticher had gifted Walt a couple seasons ago, leading to him finally finding out that his brother-in-law was Heisenberg the whole time.
3) In the second half of 20th Century Boys, a lazy highschool student named Koizumi gets an assignment to make a presentation about any japanese historical event or figure of her choice, which she really doesn't want to do. After her teacher declines her last minute decision to make one on Hitler, she randomly flips open a history book and lands on the page for the Bloody New Year's Eve of the year 2000, hastily picking that as the theme of her assignment. This eventually causes her to fall down into the rabbit hole and discovering that that whole event had been an inside job orchestrated by the Friendship Democratic Party and that the so-called "terrorists" led by Kenji Endo were falsely accused and set up by them, with this newfound knowledge making Koizumi a potential enemy of the state, all because she was too lazy to do her homework.
4) Falling Down starts with our protagonist, William Foster, stuck in a traffic jam while he's on his way to his estranged daughter's birthday party, leading to him exiting his car in the middle of the traffic and walk to his ex-wife's home. This kickstarts the whole events of the movie as the police starts going after him, all the while he becomes progressively more unhinged, collecting several weapons and doing a series of terroristic acts in an attempt to go back to his "good old days".
5) Any episode of Regular Show (especially the earlier seasons) basically falls into this trope, to the point it's become kind of a meme at this point. Usually the formula is that Mordecai and Rigby have to do some mundane task (usually under Benson's orders) which escalates into something wacky and batshit insane in the climax. In the pilot episode, for example, they both decide to play rock paper scissors to see who would be keeping a chair that was about to be thrown away, but after tying the game 100 times in a row they accidentally summon an ancient demon that begins destroying the park unless they actually get a winner in the game.
