Not bad...
If you've actually played the NES Tennis game, then you'd find this quite funny. The graphics and sounds were perfect- taken straight out of the game itself (I believe).
There's only two small problems- one, it's way too short... Uffe2000 could've added a lot more to make the video more interesting. This causes the second problem- the joke isn't too funny, and maybe if there was more, then possibly it could get a bit more hilarious.
That doesn't stop this flash video from being extremely creative... well done!