strike while the goose is hot 

To seize the moment of opportunity just as it is fresh from the oven. This is when the goose is most vulnerable, as it has just been killed and cooked. That is when you should strike.

You know, you just gotta strike while the goose is hot.
Don't wait man, strike while the goose is hot.
If you don't strike while the goose is hot, I will.

strike while the goose is hot by The Hunterman September 15, 2011