10 Most Disturbing Saw Movie Traps

At the end of Saw VI, the characters in the main trial have whittled down their numbers through competition, and this trap awaits the last two survivors.

It's a box, filled with buzzsaws, that they have to put their hands inside to fill a bucket with ten pints of blood. The twist is that, although they relied on competition to get this far, every trap in the trial could have been survived by every participant in the game, and what makes this trap one of the best in the series is the realisation that the victims who made it this far are being punished for their own survival instinct, whereas actually working together would have increased the chances for everyone.

As Jigsaw puts it, the human body holds ten pints of blood, but can survive on five. By putting themselves first, the survivors are slashing their own chances of survival, as they have to get dangerously close to that threshold.