Dead or Alive 5 Game Director Yohei Shimbori once claimed that Tecmo Koei's plans for the fifth DOA game would include "a new, more mature, look," but they were thwarted by fans clamoring for "bigger breasts." They acquiesced to fans' demands, and then with a new patch (1.03A) for the PS3, they took this a few leaps further.
A reader on GameFAQs pointed out that after installing the patch, he could move the women's breasts by shaking the DualShock controller. Shortly thereafter, videos, such as this one, started to crop up.
I've heard of jiggle physics, but this is actually starting to offend me, and I'm quite a ways down from the super-feminist end of the spectrum. If you're going to allow for this kind of sexual manipulation, at least make it fair and allow for manipulation of the men's gigantic pectorals.