Basically, take an excerpt from an RP, and make it into a "blooper". I can't really explain it, so I'll just give an example:

Not... so fast!" Toad was holding a squirtgun in his hand, filled to the brim with something green and strangely minty-fresh. He jammed the button as the Shady Koopa opened his mouth... but the gun broke apart and the mouthwash exploded in Toad's face. Toadette sighed. "Slick... reeeeeeeeal slick."

Yeah, basically something like that. Any excerpt from any part of an RP. Just for good measure, I'll do another.

The stone crashed through a building, causing heavy damage to its foundations. Then someone shouted, "Look, guys, there's Kirby!" Sure enough, Kirby was riding in on his Warpstar, Green-and-Red Jester's hat on his head and a GIM Helper at his side. When the Golem fell to the ground and the Message Box displayed "Kirby and his friend attack!", Kirby tried to ram into the Golem with his Warpstar... and missed, and crashed into a wall. The GIM helper sighed and shook his head.

I'll provide a better explanation when I can think of one.

Sorry about the double post, but I just had to add:

"Gah! There are too many of these things!" "Don't you have something like my Spin Jump that can hit more than one!" King Dedede picked up the Waddle Dee. "I have a better idea." "Great King, you aren't serious!" "Yes, I am!" He flung the little red thing into the sky, and over the walls of the stadium. "There, now we won't hear his bellyaching."