When Trainspotting director Danny Boyle's new movie was first screened at the Toronto Film Festival last September three people fainted and one man had a seizure. At its LA premiere, two cinemagoers chundered. Lord knows how many casualties there'll be when its released on DVD and Blu-ray on June 6.

The reason for the unprecedented reaction is the prolonged amputation scene in this true story of mountain climber Aaron Ralston who resorts to extreme measures when his arm gets trapped under a boulder, in the middle of a desolate canyon in Utah.

We're not going to lie to you, it's grim viewing as Ralston (played by James Franco) stabs, cuts and saws at his crushed appendage with a blunt Leatherman all accompanied by the most horrific grating, mechanical gnawing on the soundtrack.

Of course, there's more to the film than just the arm-lopping scene, as Ralston  mountain bikes, leaps off ledges and hooks up with hot girls (including the sexy Kate Mara and lovely Amber Tamblyn) but ultimately it's all about the amputation. Like... ouch.

127 Hours is out on June 6