In the movie, Hagrid shows Harry, Ron, and Hermione his hatching dragon's egg,   
   and then Draco sees it (and goes off to tattletale on the other three).  The   
   next we know, the 4 kids have been sentenced to detention, and Dumbledore has   
   sent the baby dragon    
   off to a colony.  But why wasn't Hagrid punished for possessing the dragon's   
   egg?  McGonagal admits that Draco's motives were honorable, but Draco is still   
   in trouble for being out of bed.  (Hogwarts, where no good deed goes   
   unpunished?).   
      
   In the book, IIRC, Neville (not Ron) was one the the 4 in detention.  Harry   
   and Hermione helped Hagrid smuggle the dragon away, without Dumbledore knowing   
   about it.  Neville had tried to warn Harry and Hermione that Dracon was onto   
   them.  Draco tried to    
   tell McGonagal about the dragon, but I think that she thought that Harry et al   
   had made up the dragon story to get Draco in trouble.  That would explain why   
   Draco lost only 20 points, whereas the other three lost 50 points each!   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)