Night at the Museum Easter Egg - Fool Me Once

In Night at the Museum there is a scene where Ben Stiller is talking to the curator about keeping his job. Eventually the curator decides to give him a second chance and delivers this line "Fool me once, shame on you. Fool me twice..." After an awkward silence Ben Stiller responds with "Shame on me." This is a reference to a George W. Bush speech where he messes up delivering that same saying.