While I agree that it's probably a waste of time, it can help to show extreme examples.

Even the most casual player understands that its bad to fold preflop when dealt AA or at any time when holding a royal flush. If they can see that there is a "bad" move then there must be a "good" move there, and they've basically agreed that there is a strategy. and from there it shouldn't be a stretch to understand that the skill is in coming up with the best strategy for a particular situation.