One very good example would be when selling shoes. Take that picture from every possible logical Angle to show the quality of the product.

The very fact that you have to examine the picture closely to figure out any of this at all shows just how easily we can be fooled.

And now, Sir, to reward you for the accurate guess, I will promise to paint you a careful and faithful duplicate of this very picture, provided you admit that the gift would be acceptable to you.