I will make a starting, then you decide what happens next!
also, be as random as you like. 
Once upon a time, Mario and Luigi were at a italian resteraunt, Gaining weight. But then the bathroom door swings open! Showing a mysterious figure, covered in shadows.

Once upon a time, Mario and Luigi were at a italian resteraunt, Gaining weight. But then the bathroom door swings open! Showing a mysterious figure, covered in shadows.