You're either very brave, or very stupid
It's a common as dirt line from basically every action or drama movie ever, some examples from the top of my head would be Spooks S05E08- Agenda, Star Trek DS9 S05E23- Blaze of Glory and Red Dwarf: S06E03- Gunmen of the Apocalypse (mighty instead of very, to fit in with the western theme of the episode).
I've had a google around but I couldn't find any information on this, and surprisingly TVTropes doesn't have a page for it.
Does anyone know where this phrase came from? It must be something famous because it shows up everywhere. From those I remember the earliest is Red Dwarf in 1993, so that's the number to beat.