I just so happen to love playing this. And it doesn't really work out to well with my siblings at the dinner table (we're always sidetracking and quoting out of turn. Esigh.) So, if the moderators allow this, and we get to playing it--what fun!
It kind of runs like this...
FIRST PERSON POSTS: "Two things are infinite: the universe and human stupidity; and I'm not sure about the universe." -- Albert Einstein
SECOND PERSON POSTS: "This man has insulted me!" -- Syme, G. K. Chesterton, The Man Who Was Thursday
THIRD PERSON POSTS: "That raises a terrible question." -- C. S. Lewis, Mere Christianity
Got that? Just follow the third persons lead.