The storyline is a rehash of an old joke. To improve here I would suggest trying to come up with something original and funny as opposed to using something unoriginal and un-funny.
The graphics were decent if rushed and the animation was pretty simple. I would suggest making the animation better to improve.
The sound was pretty bad. The voices were unintelligble and rushed. I knew this joke from years back. If I didn't I would probably not have been able to figure it out. I would suggest making the sound better to improve the flash.
In summary, make things better and more appealing by using more skill and get higher scoring feedback.
You're welcome!