I and a few others have found this glitch, but i didn't see it posted on these forums, so i made a video showing it. 1.) It can be done with any melee weapon. 2.) It is done by picking up a melee weapon, attacking with it, hot switching to an enemy, then picking up the melee weapon you were holding before you switched. 3.) The glitch changes your FOV and dupes the melee weapon you were holding BUT once you use the weapon that is in your hands, the second weapon disappears. 4.) The glitched FOV doesn't increase your melee distance. 5.) if you attack an ITEM like a bottle/painting/etc. after you do the glitch, your FOV will continue to increase each time, but once the weapon breaks, it is reset.

Since the duped weapon disappears after the original leaves your hands, i dont think it has any uses, but you guys are probably a lot smarter than me, so please prove me wrong!