I agree with decmax re T.L./joyflt - anyway, for those not obviously joyflts, I usually do
a short effects of controls briefing along with "you have/i have/ follow me through" then go flying after a thorough but reasonably quick preflight (telling the punter a few bits along the way to keep him/her interested).
for flying I cover the basic effects of controls and let them pole it as much as possible - sometimes you can even get them to land it - works quite well because unlike later on they are doing what you tell them.