This reminds me of a story from Feynman where he was with a math friend and they were trying to multi-task. Yet, they ended up going about the two things (counting for a minute while reading or speaking) in completely different ways. (Different enough that one could only count and talk while the other could only count and read.)

http://www.youtube.com/watch?v=Cj4y0EUlU-Y&feature=playe...