Chapter B. Symmetrical level. Two characters. One of them must push a crate on a button to free the other. If you don't do anything, the other will freak out, do it for you and die via laser in the process. You can do it instead... but you can't move the other. You died, remember? Subverted: after a while you can.
Chapter C. Halfway in the level the Wrap Around stops working at the worst possible moment, throwing you into a pit. Thankfully you save yourself. Because you landed into a pile of corpses