It was really well presented
Characters worked well and were really well sort of represented which is one of the things I look for in a flash, how the characters communicate with each other and how effectively that adds to the story. The joke was quite funny and was sort of enhanced by all of what I just said!
The characters were good the animation was brilliant in character representation.
Keep it up! I hope to see more just like this! Its a good thing you were in a rush. I think if you had done any more it would have really dragged on and gotten stale. For what you were trying to achieve (dramatic irony) I think you hit it nail on the head with the timing on it all. It wasn't too short, where I would get a small chuckle but it wasn't too long that I get bored. That medium in timing is essential, and though the length of time these things should go on is all relative, because you given yourself substantial time to set it all up right with the characters in particular it worked really well. I just found it really funny! Sort of like Leo & Satan funny, not because of the jokes but more to do with the timing.
That being said I think you should put yourself a time limit in making flashes and then think what can I do to make it better. The fact that you were rushed only seems to have contributed to the character presentation. For example when the, wine bottle is sort of startled at the end of the solo with the white background, you can tell you rushed that but the very abruptness of it leaves it more effective then if you did something really fancy and graphical.
I'm going to leave you with an example of how the same principle is applied in writing.
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Chekov's advice is that drama is heightened during passages of markedly tighter writing, and therefore if one wants to punctuate the tension of a moment one should describe it "cooly", using as few descriptors as possible. If you have written a good story the sentence "There's a kid out there; he's big, and he's mean, and he's kind of scared." is more powerful than "Through the window you can see a kid. He's a hulking figure, has a reputation for a short fuse. Yet, I can't help feeling that inside he's just a scared little boy
src: http://www.newgrounds.com/bbs/topic/1 241883
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Good job! 8/10. Because there is always "lots of" room for improvement.