15Growing Chest In Rachet & Clank
This piece of inappropriateness feels like it was placed in the game as a joke, then someone forgot to remove it in the final version of the code.
In Rachet and Clank, there is an alien girl who coordinates hoverboard races in Blackwater City. When you are close enough that she looks
at you, you can make her chest grow bigger and bigger by performing back flips and front flips. This continues way past the point where 'they' could reasonably be expected to exist. Moreover, when you crouch under them, they return to normal size.
This one feels like an accident because the effect and process have zero bearing on the game at all. It is giggle worthy for a couple of minutes, but then it is back to the meat of the game.