I didn't mind the kids on flying bikes in ET, but after Spielberg remade it, those FBI agents wielding fierce walkie-talkies blew it completely. The worst scene is after the kids dump the ambulance in the park, and there is guy in the back clearly holding a walkie-talkie like a gun. Fuck you, Spielberg.
LotR had so many, it is hard to choose. How about that scene of Aragorn falling off a cliff, and making out with his horse? Damn PJ. Don't fuck up The Hobbit.
My brother told me about this stupid scene in an episode of Heroes where most of a city is destroyed except for the Nissan Versa, and the girl character says "oh, look it's that versa again. let's take that."