My favourite one was from years ago, and I can't find it anywhere It was a Reader's Digest advert. Someone throws a letter from Reader's Digest in the bin, only it was a letter to tell them that they've won a cruise. So the bin goes on the cruise! It was just so funny, and still makes me laugh when I think of it!
The site is basically a compilation of the ludicrous ads that Western celebrities do in Japan. My particular favorites, if I can recall them, were the "Dennis Hopper and rubber duck in bathtub" and "Schwarzenegger trying to say takoyaki" ads (note that the ads weren't for rubber ducks or for takoyaki; it's just that ads are so random that those are the things that stick in my memory more than what the advertised product was).