I've never seen this video before and don't know its origins, but it appears to be a breast inflation gag in a stage production. It's pretty funny and at least a little bit exciting.
Check out Olivia Munn's spoof of home exercise equipment and breast enlargement remedies, specifically a product called "EasyCurves" which boasts of bust expansion in its marketing. The spoof is from "Attack of the Show", a program Munn co-hosts on the G4TV network.
I must admit, I wish Olivia Munn had actually done this to herself. She's gorgeous already, but there's no such thing as too much sexy. And she does address the problem of over-developed breasts quite effectively, I think. It would have been nice to actually see some process, though - watching her boobs grow. Ah, well. It's nice, anyway.
[h/t: HandyRefuse at BE Archive]