Unsupervised people on the tarmac are a nightmare, saw a lass approach a running helicopter and she ducked under the tail boom just in front of the turning tail rotor so as to talk to the pilot, riding a turbo prop a late passenger ran up to the cockpit to get the pilots attention just as he hit the start button for #1, #2 was already running, #1 prop turned perhaps one revolution, was he cranky is an understatement, the pilot that is. The late passenger could very well have been late, period, had he arrived some seconds later.