Let's Play You Have To Fertilize The Egg
Content may not be appropriate for some audiences... maybe. Nothing explicit is shown, unless you consider intentionally simplistic singing drawings with top hats to be offensive.
I'm still not sure whether this game is disturbing or humorously brilliant. It certainly is original.
The joke game was created by someone for free, though you may need to hunt around some to find a proper download link. I found this game about a week ago. Who could hate the glowing top hats?