I can't believe this.
Why zero you might ask, why zero out of five as well? Pretty simple explanation.
Imagine what a viewer would think after seeing the title, an actual sequel!(somehow)
There was no attempt here to be funny. The typical "Oh you didn't see this coming" type of humor is funny when it's random, not so bland and overdone that you wouldn't expect anywhere other than a 1990's sitcom like Full House or something of that nature.
The credits? Does that really mean anything? You're rating the animation not the credits. The credits aren't funny, and the flash isn't funny. This is another one for the fanboys and fangirls who just love C&H without reason.
You watch comedy for the situation, and the unexpected, and well written/performed antic/joke/punchline in general, NOT for the slight chance at the end, something funny's going to happen during the credits.
You're artwork is well done, your voice-over skills are as well.
I was hoping for something along the lines of the son of the bus driver. Don't ask me why, but I just figured it would be much funnier.
Well I've had enough rambling... actually try to realize that this isn't the road to follow. Pro tip: Think of Trey Parker and Matt Stone's episode about Cartmen's mom and how they didn't reveal who his father was. They got hate-mailed up the ASS.