In the event of a nuclear war for all you city folks.

When you see the big flash of light your instinct is to goto a big wall of windows and look out. This is a mistake because the blast wave of the nuclear blast will blow out the big walls of glass on your high rise and that is very dangerous.  Instead, hide under your desk holding your chair tipped over onto the floor in front of you. This will let you survive the initial attack.  Your go bag with a change of clothes, hiking boots and a few days of food and water and camping gear should be right beside you under the desk at that point. Have a meeting point to get the family together and get out of the radiation zone. A breathing mask will stop fall out from getting into your mouth or nose, wash the dust from your skin and hair if possible.