The two instructors that have demo'd it to me have used slightly different scenarios, but basically the same technique:
(Both start very high!)
John - set up a downwind approach to a field a long, long way off (normal approach profile, but we are very high) and patters the approach including "wash the speed off", "wash the speed off" until suddenly it all goes horribly wrong. His theory being that a downwind approach is where you're likely to get into the state anyway.
Stuart - Pretends to be a photographer: "left a bit, no, right, slow down slightly, come left, nono too fast, right slightly..." then suddenly you're doing the dance.
Both have an advantage in that they are 'real life' examples that show how easily you can be distracted and get into the situation.
Never had any trouble getting into it, maybe because of my non-too-sylph-like figure!