Personification (also creaturefication and objectification, as the case may be) grabs my attention more than nearly any other advertising technique. Scrubby and Mr. Mucus don't do it for me for some reason, but I can't look away from Pam.
I love this genre when it's done well because it so clearly describes what the product does. As in the Liquid-Plumr creature link above, I can see it. This effectiveness at communication strikes the teacher in me as simple yet brilliant...and also convincing.