When i was playing in a match today on two towers, i was up on the roof and i discovered a glitch !!
So heres how it goes.
1. Go up on the roof on Two Towers
2. Go to the gap in the roof [ Long gap, not the holes in the roof], on the center of the roof
3. Face the Alpha Spawn point
4. Move over to the left hand side of the gap so you are on the side of the Bravo spawn point.
5. Crouch and look at the ledge.
6. While crouching, Slowly walk.
7. When you see the screen shake, stop and you should be inside the wall.
Im sorry if i cant post a vid of this, my computer isnt very good and i have to have everything closed, while playing..