OK, here's another one, somewhat related to the first.
Those people that run and scream at the bus to wait for them (wait wait, this is not what irks me... everyone is late once in a while...) What bugs me is...once it is established that the bus is actually going to have pity and wait for the person, THEN they stop running and walk agonizingly slow all the way to the bus while all twenty plus people on the bus wait even longer on their sorry ass.