PS: the notion that an air bubble can burst inside a vacum is absurd.
Not even cocacola will fizz in a vacum. That's why you only see a small amount of fizz in the bottle where the air is after you shake it, but watch it fizz like a MoFo when you take off the top and break the small bit of vacum that is in the bottle. Without that air space in the bottle you would never know that the coke had been shaken until you broke the vacum. A vacum means no air, in case somebody doesn't know.
Your joints are infact a vacum and if they weren't then when you stood up too fast you'd experince a "knee fart".
