Apparently, a hard object falling into a pool can push a jet of air out of the water so fast that it briefly breaches the sound barrier. (scientificamerican.com)
You might let air out of the tire to set it to the correct pressure. (humblemechanic.com)
Furthermore, The bottle comes with a push mechanism that allows you to push air out of the bottle to prevent it from mixing with your baby's meal. (babygearspecialist.com)