That was a really good beginning! I was surprised at the high quality this little flash showed! Your drawing skills are good, you are good at using the music to your advantage and the scene was funny. Until it just ended abruptly.
It seems like you had a great start and put a lot of work into it, but then got tired and gave up.
DON'T GIVE UP! You have talent! Plan your work in advance. It doesn't have to be long. You just have to decide what you want your movie to contain and then keep working until you have included all of it.
I suggest reading whatever feedback you get here, discard anything that isn't constructive, then take this flash down and work until it's finished. You can do it! Ganbare! ;)