Oo, good one!
Here's a kind of similar one:
First, collect all 120 stars. Now save the file, erase that file and do that 10 more times. On the final time, Yoshi will say: "Don't you want to just save Peach and get out???" Mario will say: "Nope. Saving the world over and over and over and over and over again is a wonderful pleasure for me." Yoshi will then say: "Okay, whatever." he will pull out a Magnum and attempt suicide. Before that, he will give you a cube. After he dies, you get sucked into the cube and it is now in Daisy's castle, Yoshi is now alive again, and you will have another 120 stars to collect. Obviously, the cake will be different. If you complete the above code in less than 10 minutes, you will have to face a virtually impossible to defeat Donkeey Kong boss before the finish of the additional game. If you beat Donkey Kong, the cake will be Donkey Kong's decapitated head and in the backround is hid completly mutilated body. If you are able to do so, the game immediatly becomes rated M for Mature and if your mother is obsessive, will never buy you another Mario game again.
"Look, child. Someone is stealing my water."- Mayor
"Um, sir? It just went down the drain."- Meg
*Mayor Pours water in plant, plant absorbs water*
"Even so.."- Mayor, Family Guy