I seem to remember an ad where Alton Brown, looking rough and unshaven, urged Americans to donate to Share Our Strength, an organization that aims to feed hungry kids in America.
I thought it was pretty powerful, but I'm having a hard time convincing people that it even exists, let alone finding it anywhere on the expanse of the 'net.
/edit: I saw this in the USA some... I don't know, 6mo-2yr ago? A couple times, on Food Network.
It ran pretty frequently, up until a couple of months ago. The Food Network was supporting "Share Our Strength." The Alton Brown ad had him indeed unshaven...I remember him saying "Go on, surf the web" or something along those lines. It ran for several months during the evening hours.