During a very busy July day at Hollywood Studios, we met a brother and sister waiting in line to get on ToT. They were playing this game called Heads Up on their iphones. Everyone in line joined in and before we knew it we were right in the front of the line. It was a ton of fun. I immediantly downloaded it for the .99 and we played in nonstop in every line we were in. I believe it was either created or it's sponsored by Ellen. Basically, you take turns guessed acting out or describing the different categories of things that pop up on the phone. It's a ton of fun and a great way to kill time. Check it out. 
