A blonde and a redhead are on a trek though the forest, when they come to a rope bridge across a cavernous ravine.
As they get about half-way across the support ropes break and they both end up hanging on to the remains of the bridge for dear life. They can hear ropes starting to show strain above them - it will clearly only hold one of them until rescue arrives.
"What do we do now?" says the blonde.
"I know" says the redhead, "Let's sing to keep our spirits up!..........If you're happy and you know it, clap your hands........."