One Saturday morning, at 5:00 AM to be exact. Bowser and the Koopalings are still asleep. Lemmy wakes up.

Lemmy: (quietly) Today's Prank Day.

Iggy wakes up after Lemmy says this.

Iggy: (quiet) Wha? Lemmy, was that you?

Lemmy quietly jumps off the bed.

Lemmy: (still quiet) Yes, that was me. Do you know what today is?

Iggy: (still quiet) Prank Day.

Lemmy: Exactly.

Iggy: Let's get-

Lemmy: To work!

Lemmy and Iggy quietly set up lots of pranks and traps in the next hour. It is now 6:00 AM.

Lemmy: What do we do now?

Iggy: Let's just play-

Lemmy: Videogames!

Lemmy and Iggy go to their room and play New Super Koopa Bros. until 7:00 AM, when Bowser and the other Koopalings wake up. Roy goes downstairs.

Roy: I'll have breakfast, work out, and beat up Iggy.

Roy walks near some rope. His foot goes through a knot in the rope, causing him to trip and fall down the stairs.

Roy: OOF!

There is a bucket that pours out mud. It lands on Roy's face.

Roy: What the? What's all of this mud doing on my face? Whoever did this will pay.

Morton leaves his room.

Morton: Wow! What a beautiful day! The sun is bright, hot, warm, yellow- OOF!

Morton didn't see where he was going, as he focused on talking.

Morton: What the? When did this wall get here? Oh well.

Morton continues to talk, but we don't care about what he is saying.

Wendy leaves her room, and Lemmy and Iggy step out of their room.

Lemmy: Hey Wendy!

Iggy: We want to show you something.

Wendy: Oh, whatever. This better not take long. I don't want to miss breakfast.

Lemmy and Iggy show Wendy some random video. At the end, a creepy picture of a zombie Mario is on the screen and a loud scream is heard.

Wendy: Oh my DAD! How dare you show me this? I hate you!

Wendy stomps out of Lemmy and Iggy's room.

Lemmy: Everyone knows that Wendy-

Iggy: Would say that!

All of a sudden, another scream is heard in Larry's room.

Larry: HOW DID I WET THE BED?!

The prank pulled on Larry is the "Hand in Cold Water" prank. Lemmy and Iggy got into Larry's room when he was still sleeping. They had a cup of water and placed Larry's hand in it. It caused Larry to wet his bed.

Larry: I've never done this since I was a baby. If someone caused this, they will pay, BIG TIME!

Ludwig hears the screaming from Larry.

Ludwig: That was weird.

Ludwig goes to the bathroom. He may be very smart, but he doesn't see 2 packets of ketchup. He presses his hands on the toilet seat, and the ketchup gets all over him.

Ludwig: What? Ketchup packets on the toilet seat? Who could've done this?

Ludwig goes to the kitchen to have breakfast, finding Roy, Wendy, Morton, and Larry at the table, not very happy.

Roy: I got mud all over me!

Wendy: Lemmy and Iggy showed me a "Screamer" video.

Morton: I bumped into some wall that was never there. It was hard, bumpy-

Other Koopalings: WE GET IT!

Larry: I somehow wet my bed.

The Koopalings start to chuckle.

Larry: SHUT UP!

Ludwig: Lemmy and Iggy are probably behind this.

Roy looks at the calendar and fines "Prank Day" written on a Saturday.

Roy: Oh, they're gonna get it.