There was a guy on
escena.org yesterday talking about
this pong in 1kbytes done in openGL. So, once again, I felt challenged and tried to
do the same with Actionscript 3.
And well, after a bit of tweaking here and there, seems like managed to make it in
1,022bytes :D

You know where the sources are,
don't you? But if you just want to see the snippet,
here it's too.
EDIT: Kristof Neirynck has ported the code to AS2, and after a few tweaks turns out that AS2 creates tinier files than AS3. At least in this case.
pong0.5k Maybe when going a couple of kbytes up AS3 would win AS2.
EDIT 2: And now, for something completely different,
the same game in 393bytes. Nice one Matthew! :D