Not quite a bus, but I had a similar issue on a flight to New York recently. I was sat in the window seat with a rather portly lady next to me. I lifted the arm rest to get into my seat then she sat down next to me and I was unable to pull the armrest back down due to her 'largeness', meaning I couldn't use the in-flight controls until she got up to go to the loo. At which time I pulled the armrest down, plugged in my headphones and was beginning to get into the Dark Knight when she came along, sat back down again and as she seemed to be perched (wedged?) between the armrests she was unknowingly interfering with my TV controls! As fast as I was turning the volume down again it was going up! Sorry if that sounds a bit insensitive, but yes. If you need more space you should pay for it. They do in Business/First Class...
