Harry Potter & The Goblet of Fire (DVD) #2

The duel with Voldemort and the return to the school. You've seen it, and if you haven't you should. The echoes of Harry's parents coming out of Voldemort's wand, Cedric begging that Harry take his body back, Cedric's father wailing over the body of his son. This was the point where the books got really, really good, and really, really sad. One probably has something to do with the other.