After 10 years almost on the bus I can absolutely, categorically confirm that I still have occasions which make me say "what is it doing now?"
It's these damn computer glitches. Classic example is you land from a longish 4 hour flight where the aircraft is supercooled the outflow valve opens on landing and if its humid and hot (ie where I am) the evacuation horn starts sounding, cabin music goes to full blast. Great stuff.
