I found this examples in Communication Arts magazine.
The first is an advertisement for Purell hand sanitizer. I found this effective because especially nowadays with the all the swine flu scare I think a lot of people are obsessed with germs. I know I get paranoid and immediately grab some hand sanitizer in certain situations. This illustrated one of the times people start to think about all the germs they're getting on their hands at that moment, the elevator buttons. By actually putting the words of what you could be touching by the buttons, I know it makes me want some Purell.

The second design, I just liked the style. I love collages so I tend to be drawn to those pieces, and I think this one is a great example. I also loved the line "you both know bullets travel faster than backup." It added some real emotion to the design.