yeah, if i was in the box (ambulance) i would have cranked up the whalen and popped some T3 or MAN siren on them and watch them code brown there pants when the voice from above (external speaker) asks them what they are doin/thinking. Then if it was in a tunnel it would have echoed pretty good as well to re-enforce the point. At work when driving I make good use of the siren/horn when drivers do stupid things around a ambulance (like pull infront of me and hit the breaks and im running code with a patient in back)

I wish i could understand why they do stupid stuff like this, but then again I dont have a problem telling them what i think of them and there choice of job especially if there doing something stupid (sitting in handicap seat,etc)