Try teaching it in an R22: It might go something like this :-
1) Brief it
2) Go out and fail to demonstrate it (the aircraft will roll the wrong way)
3) Go back to the briefing room and talk about couples instead
I seem to remember it's quite easy to demonstrate in an R22, from the hover you put the stick forward a little bit and keep it there, you will get flapback, push it forward a little more and the aircraft will start to accellerate and get ETL, you get inflow roll (to the right), caused by transverse flow effect.
Although I'm sure the actual aerodynamics are much more complicated than the simple explanation we learn.