Not bad
I gave it a 3. I would have given it a 2, but I thought this was extremely good for being anyone's first movie, so I had to raise it a little. Either way, it doesn't suck.
But, I hope that for your next movie you improve your microphone quality. At the end, I couldn't really hear what was going on at all. Also, you could work on your animation (a person walking actually moves his feet every now and then) - still, the art was pretty good for a beginner if you only added some more movement (perhaps by breaking the character into pieces and tweening the pieces?).
And for some reason I suspect that it could be possible to lower the filesize a little... But I may be wrong, I'm pretty fresh with Flash myself. I just thought it was quite a filesize for telling a joke.