Have you ever noticed the disproportionate amount of elderly people on buses, especially during the daytime. Travelling often by bus has allowed me to study the migratory pattern of old people. I call my theory:
Musical Old People
Old people (an infinite clique) board a busy bus, and must sit apart from each other. As people get off, they move about, seeking to be next to the "Queen" - i.e. the one who still has her natural hair colour. Every time the bus stops, an old person is taken away, and the chairs must find an old person to sit on each of them, or else they could have curry spilt on them.
If that is too much for you, have a look at my dream. It's rather odd.