Live Free or You've Gotta Be Kidding Me

Giant nuclear lizards.

Source: Once, many years ago, I was watching the movie Godzilla (or something similar) with my parents. After about an hour of watching this movie, my father (who worked in the airline industry for several years) jumped up to complain about how the outside of an airplane they showed did not match the plane cabin that the actors were in. That was the scene that drove him over the edge. I exclaimed "GIANT NUCLEAR LIZARDS!!!" to remind him that the entire premise of the movie was implausible, and once you suspend your disbelief over something like giant nuclear lizards, pretty much anything is possible.

Explanation: Yesterday, Sarah and I watched Live Free or Die Hard and during one of the final scenes, I looked up and proclaimed that we had exceeded my threshold for implausibility. Mind you, at this point, digital terrorists had already seized control of every traffic system in the country, set off the anthrax alarm in a government agency, hacked the New York Stock Exchange, and shut down power to the entire country. Oh, and let's not forget the gorgeous ninja computer hacker woman - oh, I totally remember her from my computer science classes in college.

I could go on to explain the exact scene which drove me over the edge, but I don't want to "ruin" the movie for anyone.