I used to play this game on another forum. The way it works is this: one person posts the title of a movie and a actor/actress who appeared in that movie. The next person then posts another movie that person appeared in, then another person from that movie, and so on. For example:
Post 1: Hancock - Will Smith
Post 2: Will Smith in Independence Day.
Independence Day - Jeff Goldblum
Post 3: Jeff Goldblum in Jurassic Park
Jurassic Park - Sam Neill
And so on. The actor/actress does not have to be the lead--supporting cast or even minor role is fine. And of course it goes without saying that it's not fair to use a person that only appeared in one movie (not that there are very many of those). And please try to keep this in movies-no TV shows.
Oh, and sequels are allowed, too.
I will start with:
The Princess Bride - Cary Elwes