Mario has flashbacks but of other games
Mario goes into the castle and talks to Toad about showering before he has a flashback. In the flashback, which takes place in Mario's house, Toad is searching for Mario, wanting back the drugs that Mario stole from him. Toad then finds someone taking a shower. He enters to find Mario naked and immediately rushes out, running into a wall and falling unconscious. Mario exits the shower and finds Toad lying on the ground. He then tries to wake him up, ending the flashback.
Next, Mario goes to Jolly Roger Bay and finds a pink Bob-omb who doesn't like water. Mario has another flashback about a "person" who shot water, F.L.U.D.D., who analyzed Mario and half-insulted him. Mario reveals he killed F.L.U.D.D. after that conversation. The pink Bob-omb replies by saying that Mario sucks at making flashbacks.
Following that, Mario goes to the top of The Castle and talks to Yoshi, who is sad because Mario keeps cheating at Mario Kart. This causes Mario to have a flashback of him throwing infinite Red Shells at Yoshi. Mario then remembers something even worse that happened to Yoshi, as he has another flashback of Yoshi getting in trouble with Master Hand for hacking his YouTube account.
Mario then tries to cheer up Yoshi by reminding him of the time when they were playing Banjo-Kazooie and accidentally found the secret of Stop & Swap, which Yoshi quickly realizes actually never happened. Yoshi then commits suicide by jumping off the castle, with Mario exclaiming that's a flashback he'll remember.
Later, Mario goes to Bowser's Lair, where Bowser is trying to think of evil things to do. Mario tells him that he isn't the only evil villain, and starts naming other villains that he knows. Bowser gets angry because of this knowledge as Mario flees and returns to the castle.
Back at the castle, Mario sees all the fish in the aquarium have become Stars. Mario asks Toad why this happened, to which he explains is because he thought that the Stars needed more space. Mario then has a flashback about a Star hitting him super hard and making him fly.
In the castle lobby, Mario asks Toad if he likes pranking. Toad says that he is "The Master of Pranks", especially with Mario. Mario has another flashback of a lady pulling a prank on Peach because she wanted to give Peach a gift, but the gift was only a fart. Toad says that was not what actually happened and shows Mario a picture of what actually happened. Toad then asks Mario why he has a mark on his cheek. Mario has yet another flashback explaining this mark, in which a bomb was planted, and Mario tried to stop it from detonating before a cannonball struck him in the face.
Mario then gets bored of remembering the past and leaves the castle, ending the blooper.