Re: What was your favorite beginning for an adventure?
The GM gave us pregens, though each one of us got to sit down with him and tweak things---if he allowed.
He gave us some written background to the whole world, but told us nothing about our characters' background.
First session, he gets us to sit down, and starts "As the funeral of the master of manor continues, the priest droning a eulogy full of cliches, you look around, seeing the people crying, and those with set, grim face. You cannot help but think on the series of events that brought you here." He then went around the table, giving the background of each character, and recent events as s/he saw them. The whole time, the GM kept coming back to the funeral, moving it along a bit at a time, while weaving in the flashbacks.
It was totally masterful story telling. Gave me a chill.