I've seen two pictures in the genre this morning. One was of that weasel David Miliband who is leaving politics for a lucrative position in New York. The other, of the Jabba-the-Hutt-like Eric Pickles, was really quite funny because it made his extra chins look even grosser than they actually are.
No-one else ever gets photographed like this. Only politicians. Oh, and the odd actor. Tom Cruise, for example, at the end of War of the Worlds. With Cruise you'd have to do more than bend a knee, you'd have to lie flat on your back to get the desired angle.