Oxygen masks will drop from ceiling during emergencies, how about during regular flights?
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Slight correction for comments on bleed air from the engines (most planes do this, except the 787). The bleed air is constantly pushing in the same amount of air, but there are one or more big valves at the back of the plane that let that bleed air back out, and they open and close to keep the cabin pressure constant. They can have various appearances, but [this is an example](http://www.b737.org.uk/images/pressvalves_ng.jpg).
This is also why a bullet making a hole in a plane’s skin would do nothing. Those valves would just close a little bit to compensate.
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