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Sarah Palin may pop up on SNL to strike back at Tina Fey, according to the Chicago Sun-Times' Bill Zwecker. A spoof of Fey's American Express ads is apparently being discussed, possibly for the next live SNL on October 18 or for this Thursday's SNL's Weekend Update special. And while it would certainly continue the show's recent winning streak, Palin and Fey-as-Palin together on the same stage may very well create a time paradox the results of which could cause a chain of reaction that would unravel the very fabric of the space-time continuum and destroy the entire universe. So be warned, we guess. [Chicago Sun-Times]