Sometimes there really can be too much of a good thing. This can be seen by the existence of “Saw” 1, 2, 3, 4, 5 and now 6. Enough is enough, people. Can’t we just let it go?My hatred for sequels goes way back, and that’s probably why you won’t see me in line for the Hangover 2. But this past weekend, even I broke my own rule by watching “Paranormal Activity 2.” What’s life without a little risk rig...