I watched Coherence a few months ago...wow! Never seen anything like that, a sci-fi movie that favours strong characters and interesting story over special effects. Highly recommend :)
Once got caught in a rip tide when I was in a sea in Australia, kept dragging me further and further out! Somehow managed to swim to the side and back to shore :/
Whiteboards for sure :) This article is about declining chalkboards...
http://abcnews.go.com/blogs/lifestyle/2009/10/death-of-the-chalkboard-declining-sales-driven-by-cheap-whiteboard-production/