Seeing Dark Knight free and four hours before the midnight showing cause I signed up for a training seminar for a new chip Intel had sponsored by my job.
The seminar was just a tell-all and summary of the new processor chips Intel came out but it was only 30 min and they gave us unlimited Dominos and soda for the movie. Took two large sized pizzas home with me and a 2liter bottle of soda
They even had a raffle where guys won everything from processors , to TVs to even a new CPU.
The feeling of already seeing a movie hours before anyone else could and walking out of the theater seeing your friends waiting in line for another two hours was worth it
Transformers and Rush Hour 2 are honorable mentions.