If a bunch of people head to the front door to get off the bus, do not stand at the closed rear door, wait until everyone exits via the front, and then say “rear door.”
Sheesh, how much energy is involved in walking to the front of the bus?
On a similar note, drivers who seem to be playing “passenger ping-pong” on corners by taking them harder than necessary, causing passengers to slide around on seats. For someone who’s already having back or hip pain, that is REALLY annoying.