A DOLLAR WOULD BE NICE. . .
. . . . for every time taxying out with half a dozen captive sightseers, looking wide- eyed and expectant after they've clamped their headsets on and
driver- airframe says softly looking each in turn right in the eye, "Just testing. These Dick Smith headsets have been playing up a bit today - would you shake your head if you can't hear me at all?"
The only time this routine backfires is when some Edward de Bono taps you on the shoulder and throws some aviation related mind-stretching conundrum or riddle straight back.