An airplane typically cruises at an altitude of 30,000 - 40,000 feet.

What would actually happen if a window or emergency door came off of a plane cruising at 30,000 feet? Why? Be sure to use what you have learned about the gas laws in answering.

If an emergency door came off a plane at 30,000 feet, anyone standing near the door will sucked out. Then the cabin will cool and become very foggy due to the rapidly expanded cabin air.

http://www.madsci.org/posts/archives/jan2001/980973572.Ph.r.html