Since the human breast does not contain bone of any sort, if put under great momentum they will move in what one might describe as a "jiggly" manner.

Some games, most notable those of the fighting genre, tend to increase this "jiggle" quite substantively.

Nowadays it has become sort of an injoke or a tradition in the games industry, especially in japan, to include intentionally exaggerated breast physics.

My only complaint about the whole ordeal is that I always get distracted when my opponent picks Chun Li. Capcom, please fix your game.

I have an image but it's unfinished. Just imagine the laser is green and upvote-y.