Try some of the Leunig cartoons such as Fun Mask and Guru. Although some of his cartoons such as "The Strain of Being Acceptable" are a little tougher to understand (with respect to change), you can basically talk on and on about facial expressions.
yeah those michael leuin images r really good! i've used most of his pictures as supplementary material for my prelim course ... i cant use these images this year tho... they dont fit into my change category!