I find this difficult to laugh at
I suppose the main purpose of this flash is to amuse and this is something it doesn't do for me, the phrase isn't funny and it really doesn't make for a good joke. The animation and voice acting of this flash however are both good and that works pretty well, the style with it in black and white, well greys, is a decent style too.
Maybe the length is also an issue, but if it's based off a comic then that would explain why it's shorter but it could have gone further if you had added something afterwards, would it have made it more funny? It could have in a way, but not really sure. Basing a flash off a common phrase or a comment, in my opinion, is hard to pull off.
In short, I think everything is good apart from the concept.