I used to travel often with a guy from IBM who read somehwhere the maximum takeoff times for various aircraft. He memorized it and on every takeoff would spend all the time looking at his watch. I was generally ok except the couple of times he went "huh".

I just hated him doing that.

I've been in a couple - both on AA DC-10's back in the day with the cockpit cameras. Actually, the calmness of the flight crew was pretty reassuring.