(Final lines) Christopher Gardner : How many planets are there? Christopher : Um... seven? Christopher Gardner : Seven? Nine! OK, who's the king of the jungle? Christopher : The gorilla? Christopher Gardner : Gorilla? Nope. Lion. Christopher : Yeah, lion, lion. You wanna hear something funny? Christopher Gardner : OK. Christopher : Knock knock. Christopher Gardner : Who's there? Christopher : Shelby. Christopher Gardner : Shelby who? Christopher : Shelby comin' round the mountain when she comes, Shelby comin' round the mountain when she comes! Christopher Gardner : Hey, that's good. Christopher : Knock knock. Christopher Gardner : Who's there? Christopher : Nobody. Christopher Gardner : Nobody who? (Christopher doesn't respond) Christopher Gardner: Nobody who? (Christopher still doesn't respond) Christopher Gardner : A-ha-ha, that's a good one, I like that!

http://www.moviequotedb.com/movies/pursuit-of-happyness-the/quote_18929.html