When I took the Fundamentals exam on Saturday, the first two guys to show up were me and I guy there to take the Principles exam - crate of books and all. It was weird - obvious one of us had eft up badly but we didn't know who.
Last April when I took the PS exam a guy didn't make it back in time after lunch. I saw him waiting in the lobby for the state specific after I finished the PS. He didn't look pleased. This past Friday he took both the PS and the State Specific again. I'm guessing after you've blown any chance of passing the 6 hr exam your head probably just isn't in the game for the 2 hr one.