Well idk, I was playing with some guy the other day and he told me two things that seemingly worked. First at the mainframe, if you go to the furthest grate near the stairs straight across from the Kar, there is a piece of paper in the grate. If you look at it and press X/Square your character will sigh which supposedly raises your chances of getting the Ray Gun, Wunderwaffe, and Monkey Bombs. Go to the room by the Furnace room with the chalkboard and desk near the bridge to Juggernog and the Teleporter, on the desk will be a red bottle that you'll look at it and press X/Square until your character sighs and it will supposedly upgrade your Juggernog allowing you to take a couple extra hits. You'll have to press and hold those buttons for a while, maybe up to a minute, but I promise that it worked for me the other day.