Boom, butterfly effect

At the beginning of Until Dawn, it insists that the choices which you make in the game will effect the story, and that small decisions will have big impacts, like the butterfly effect. Near the beginning, a character talks about the bizarre way in which they met someone, which could be attributed to the butterfly effect. Joe understood that the game was trying to convey the theme of the butterfly effect through this conversation, so he began acting out an end to the conversation where the character explains this in detail, to poke fun at how obvious it was. But then the character proceeded to actually end the conversation in that exact way, making it even more obvious, and ending by saying "Boom! Butterfly effect." From this point on, Joe started saying that any minor decision he made in the game would have major implications due to overly-convoluted events, such as not shooting a squirrel leading to that same squirrel later saving his life.

“Boom Butterfly Effect” by Marik Bentusi.

In one of the murder cases of Danganronpa V3, the way in which the victim is murdered involves a seesaw. In the hangman's gambit section of the class trial, you have to guess the phrase "seesaw effect" in a hangman-style game. This phrasing must've stuck out in his mind, because later on he started saying "Boom! Seesaw effect".