This is a timely post! Just yesterday I sat on a TWA (TWE) Jetstream Turbo in Columbia, MO, waiting for take-off to STL for my connection to SEA. We sat and sat in a very warm plane on the runway for quite sometime. Suddenly, the door reopens and a woman ducks into the plane and speaks to a man seated in the exit row. They apologize saying they were sorry but they did everything they could but he would still have to get off the plane.
Everyone on the plane is of course staring at this turn of events and the man leaving the plane jokes about it saying, "Are they taking me back to jail?" The door closes after him and the plane is now abuzz with interest. Finally the pilot comes on and explains that they had to reduce the weight because of the heat. What is interesting is this man weighed less than 200 lbs. so their calculations must be very close! We took off successfully, so that I could then sit on a TWA 757 at the gate in STL for an hour while they "worked on a logbook."