for god's sake, move down the back!…if you find yourself halfway down the bus, during rush-hour, with the entire rear of the bus’s aisle not only empty, but with half a dozen seats still there for taking, please don’t just stand there, acting as a dam against the ever-increasing human stream forcing its way up against your inconsiderate arse.

Moving back, and up that one small step is all that divides you from a possible seat, and from allowing another ten or so people onto this bus, instead of causing them to wait 10 minutes until the next (probably also overcrowded) bus arrives. Arsehole.