your best you have ever done!

I've been playing some great "bullet hell" videogames (q.v.), one of which has a warning screen I never noticed before-- in DonPachi, the alarm which flashes before boss battles includes the text "THIS IS NOT SIMULATION. GET READY TO DESTROY THE ENEMY. TARGET FOR THE WEAK POINTS OF F**KIN' MACHINE. DO YOUR BEST YOU HAVE EVER DONE."

F**kin' machine?