I found a simple way to fizz up a flat brew

[shane_vor]

Of course for my chalk method to work you have to have some chalk laying around which probably means you're either a teacher, have young kids or you're a lawn bowler.

OR you play darts...at the pub!!!

[lethaldog]

Drink faster and refill, always works for me, if your beer goes flat then you dont drink it quick enough

[Ahutchy]

Drop a bit of the local newspaper in ( a small torn off bit).

It will fizz things up surprisingly well.

AH

PS. This is not a joke reply, but I can't guarantee the flavour wont be affected.