Well, now I'm feeling really sad. I just watched a QnA with Robbie Jarvis, and according to him there was a lot more filmed for the Snape's Worst Memory scene in movie 5, including the stuff with Lily. Why can't we get that in the special edition, or as deleted scenes?
Of course then he told the story of how he got the part of James and it cracked me up.
Video here
Harry Potter Actors Panel - LeakyCon 2012 - Part 1/3 - YouTube