Watch someone blow three bubble-gum bubbles inside of another bubble. I'd say this is the bubble gum equivalent of Russian nesting dolls.
You can see the amazing video here. This seems like such a fun talent to have, and a difficult one to learn.
I'd love to know what kind of bubble gum she is using for this. Whatever the brand is, this would make an incredible advertisement for the gum.
See also: Online bubble-blowing toy