Here it is, the 4th installment of this crazy and stupid series :D, banana.
Plot (start of the video)
SMG4 has reached 29,999 subs. Mario, Luigi, Starman3, Toad and even Peach (with a cake) celebrate and congrats him. They wait for hours and hours for him to get 30,000 subs, but one week later, practically nothing changed, and someone unsubscribed him. SMG4 eventually got so angry that he blew up Peach's Castle, killing everyone inside.
Plot (title screen)
The title's a parody of the Adventure Time theme song.
Plot (middle of the video)
A guy is flying with the flying cap, singing "I Believe I Can Fly". The guy then hits the castle, falling down.
Mario joins a choir naked but messes it up.
JamalioHabbo14 is on fire, screaming that he is.
Peach turns herself in a random shape. Then she sings "Wannabe" by The Spice Girls but distorted.
A guy punches Mario34299 Then he laughs and claims that was a joke.
A guy is walking around the Bob-omb Battlefield. Then the wizard comes around saying "YOU SHALL NOT PASS!". The guy says "Oh, okay." and walks away. Then the wizard says he's lonely and he wants him to come back, But it was too late.
A guy is playing piano. And then another guy wants to try, only to find out that it was Mad Piano and he ran away from it.
Peach tells Mario that the power of the stars is restored to her castle. The results end in rage due to the fact that Mario didn't care and Peach wasted Mario's time.
Luigi is wearing Dragonborn's helmet and says "Spaghetti". Then he blasts stuff with his hand.
Mario enters into Peach's castle, singing the "The party don't start till I walk in." part in Ke$ha's "Tik Tok". SMG4 then screams due to seeing Mario naked.
A family says random things like "duh duh blah duh duh blah blah blah" and "blah duh blah duh duh".
A father says to his son Jacob to keep his shirt on. Jacob refuses to keep it on and then runs off.
A chimpanzee rides on a Segway (that "Chimpanzee Ridin' on a Segway" song).
Enzo wants a guy to teach him how to go through paintings. The guy says he just has to believe. Enzo then tries to go through a Bob-omb Battlefield portal but fails (because it is the real Bob-omb Battlefield painting) and says "D'oh!". Then the Toad next to the painting says "MAGIC", and makes pig noises.
Meanwhile, SMG4 is still waiting for his subs to go up to 30,000. A picture of Starman3 saying "BAH!" scares him so much that he screams and blows up.
A giant Wario tells a village to get in his belly.
Mario is Bowser surfing to the extreme. In real life, he is pretending to be a car.
FightingMario54321 gets up by a pile of ducks in a place from My Little Pony, then he asks: "Where am I?", "Where the hell am I?!?", "What are these?" and "What the hell are these!?". Then he goes crazy.
King Bob-omb is happy that he is getting a piggyback ride from his son. Then the son says: "Kill me!".
Mario is naked and is chasing Luigi, saying "I love you!".
Possibly continued from skit #18, Mario is staring at Peach, only to find out that it was Old Man Hobo disguised.
Plot (end of the video)
Bowser thought that the video would end with a naked Bowser in the bathtub, but then Old Man Hobo came to his castle and said to go on an adventure. They took the bathtub Bowser is on and flew to the sky (derpy hooves in the background), but they came crashing to the ground in front of Peach's Castle. Then it is revealed that SMG3 is watching the video, he says it is terrible and explodes.