Channy wants to blow up her first hot water bottle, but based on her blowing pressure measurements isn't sure if she can get it started. So she requests help from Kira, who is 5" shorter, but has some serious lung power. Channy starts out, with both ladies taking great delight as the rubber vessel "erects" itself, and then pushes as hard as she can, but just can't stretch it enough to begin expanding in earnest. Kira gets her own surprise, and the back pressure is more intense that she expected, but she puffs her cheeks to the limit and pushes in breath after breath. When Channy tries again...

Channy wants to blow up her first hot water bottle, but based on her blowing pressure measurements isn't sure if she can get it started. So she requests help from Kira, who is 5" shorter, but has some serious lung power. Channy starts out, with both ladies taking great delight as the rubber vessel "erects" itself, and then pushes as hard as she can, but just can't stretch it enough to begin expanding in earnest. Kira gets her own surprise, and the back pressure is more intense that she expected, but she puffs her cheeks to the limit and pushes in breath after breath. When Channy tries again she is delighted to be able to contribute to the inflation effort, and both continue to trade off until the inevitable noisy surprise occurs.