It is winter. You are panting with fatigue because for the past 30 minutes you have been running and walking to get away from a band of zombies. The zombies have been moving slowly in the cold, but so have you because the snow comes nearly to your knees. You come to the edge of a clearing. Normally you would skirt around the edges, but that would take time. You decide to risk a straight path across. A hundred feet from the edge of the woods, and you hear a large "crack". As you plunge through the ice, you realize it was not a clearing, but a frozen lake. What do you do?
The Art of Manliness has an infographic on surviving a fall through the ice, and some additional advice. Check it out at the link.