Here is a glitch found by me and my clanmate EmoKid/SteaIthing.
Sorry for bad quality (I used ingame recorder because I didnt have fraps running, it takes like 10 minutes to get back in after minimizing)
1) Jump up onto the crate (If you don't know how you are a lost cause)
2) Try to jump up on the player (He cannot crouch or it won't work, Jump on his arm to get up)
3) Lag walk towards the middle of the ledge thing.
4) Never die in QR