I was in a guard tower at one of the air fields. I was crouched, facing 90 degrees from the ladder, with a solid partition (NOT A RAILING) between me and the ground.
When I unslung my MOSIN from my shoulder while still in the crouch position, my character stood up, ran forward, clipped through the guard tower side, and fell to his death.
During all of this, I only pushed ONE key, (my #2 hotkey, which the MOSIN was bound to, the hey I pushed to bring it into my hands.)