Originally Posted by encore

No way would I ride the jumpseat during a deadhead.

You're on duty with the company in an aircraft type you're qualified on. The crew busts an altitude and causes a loss of separation. The FAA wants to interview everyone involved. You start getting asked things like "why weren't you wearing a headset as a required crewmember?" "Did you see the altitude they set in the preselect?" "Did you tell the captain that he shouldn't have been using his laptop that the FO admitted he was doing?" "Why did you take the jumpseat and accept additional crewmember responsibility when you've already flown over 8 hours that day?"

Or... you could just be getting paid to be a passenger in a seat that was booked for you and contractually owed to you.