On the FOTR commentary, the actors who played the hobbits made up a game (leaving Elijah out) called Tig. Sorry if this is already done in an older post.
Here are the websites that can help you play tig:
http://www.much-ado.net/tig/tig.php?p=aboutand
http://www.angelfire.com/freak2/tig/Basically you say tig and the next person replies as tag or tig or tog.
basic rules
sad from the commentary)
-- you can't tig on a tog
-- you have to do an elephant impression if you're gonna tig Billy
-- you can't tag on a tig
-- you can't double-tig a tag
-- if Billy's gonna tig you back, you have to get on your knees and take your trousers down