Awkward moments and the bus stop

What is it about those awkard moments when a bus has come along, stopped to let you on board and then when you have had a thoroughly lovely time, or what your thought was a lovely time then comes that awkard moment when the bus stops. What do you say, how do you say it, how do you know what the other person is thinking. Do you sit around and wait or do you head straight back to the bus stop, or do you give up on public transport all together and just decide to walk.