I usually refer to this phenomenon as crowding at the doors. I believe most Indians have this mentality. Be it bus or train, they will always crowd at the doors even though there is plenty of room inside to sit or stand. Previously I used to think it was just Mumbaikars who have this habit from traveling in the trains, but then after flying for approximately 75 times in last 20 odd months, I have come to realize this effect is all over India. I wonder why people do that.. I mean it only causes inconvenience to others. Every morning I have to push people out so I can get in, since all the doorways are crowded. I wish people do have some common sense and learn to utilize the space more appropriately.