Practice forced landings on flight tests are a good source of unusual responses, especially on the passenger brief. When I learned to fly it was "Take your pens out of your pocket!!"
In Oz it's "Take your false teeth out!"
And I recently flew with a Seth Effrican, who told me to "Take all your stilletto shoes off". Forget the seatbelts and the brace possie!
Then there was the student who patiently told me there was nothing wrong with the engine, I'd simply closed the throttle by mistake. *Sigh*
There are some other good ones on the Jandakot Tower page.http://www.swannet.com.au/moby/jandakot in the "did ya hear?" section.