I was once on a 73 bus as it pulled into Bristol Parkway Station. A bloke in a hurry jumped on and asked "Is this bus going to the Mall?"
The driver said "No. The centre. The 73 to the Mall uses the other bus stop."
The bloke asks, "How long will the next bus be?"
The driver honestly looked slowly over his shoulder, down to the back of the bus, looked back to the bloke and said, "Almost exactly the same length as this one."