- Ron and Hermione are checking out the Shrieking Shack, "the most haunted building in Britain."
- They get taunted by Malfoy, but Harry, in his invisibility cloak, shows him and his toadies how it's really done.
- He pelts them with snowballs and pulls off their pants until they flee in terror.
- Back in Hogsmeade, Harry witnesses the Minister of Magic enter the Three Broomsticks pub with Professor McGonagall.
- Harry decides to get his eavesdropping on, following them under his invisibility cloak.
- McGonagall says that Sirius Black destroyed his friend Peter Pettigrew when Pettigrew tried to warn Harry's parents about Voldemort's return.
- And an even bigger bombshell: Sirius Black is Harry Potter's Don Corleone. i.e., his godfather.