I noticed this when i watched Tron in RealD a few days ago. the trailers were played right after each other.
https://www.youtube.com/watch?v=In-m2RJw3hE
https://www.youtube.com/watch?v=3H8bnKdf654
Look at 1:37 in (Cowboys and Aliens)
Look at 0:06 in (Transformers 3)