After spending several hours wandering through the woods, Bob and Jim are thoroughly lost. Disorientated, they sit down to discuss what to do next.
"Hey, I have an idea," says Bob. "If we each fire three shots into the air, someone will hear them and come to help us."
Jim agrees, so each of them fires their shots. An hour later, nobody has come to help, so they decide to fire three more shots. Another hour passes - still no one.
"Okay lets try this one more time" says Bob.
"Dude, this had better work," replies Jim. "These are our last arrows".