Horrible Bosses has its funny moments, but there's a couple things that just don't add up:   really hard to believe that Jennifer Aniston's character would have any interest in that weasly assistant.    And they seemed to put to sleep every damn patient that came into the office (and I mean that literally and, er, literally).  Do dentists really put you own to change a crown?  I was unable to willingly suspend my belief on those things.