I don't understand why everyone is talking about hobbits being liars. Can anyone find an example (besides Bilbo's lie about Gollum giving him the Ring as a present, which was mostly because of the nature of the Ring) of a hobbit telling a lie? The examples of Shire-folk being the first to smoke pipeweed and hobbits bowmen aiding Arnorn from the prologue are things that are maintained in hobbit lore, but that is probably just because they are stories that have been passed down from generation to generation; and whether there is truth in them or not, I doubt the hobbits intentionally lied.
Edit: I cross-posted with Firefoot (who made some excellent points

).