Some of the worst hits I have ever taken in an airplane were Cajon pass (followed closely by Banning and Tehachapi). Even in the tough little Hiperbipe it felt like flying into a brick wall. No kidding - smooth as glass and then WHAM! All the stuff on the package tray behind us was now on the top of the instrument panel and our laps. Good thing I wasn't carying a frozen turkey! You could have made Lancaster or Mojave early this morning without much drama but the window was closed by 10 AM.