Two avid hunters take a hunter's safety class in which they learn that the universal signal for an emergency is three shots in the air.
Sure enough, on their next hunting trip the two men get lost.
One says to the other, "What shall we do?"
The other says, I know fire three shots in the air and someone may come to find us.
He fires off three shots, and they wait two hours. No sign of help.
What shall we do? Fire off three more shots. So he does. Three hours later there is no response and it is getting dark. The one says "Shall we try again?"
The other says, "I guess not... I only have two arrows left...