A jet is carrying the pilot, the world's smartest man, a Catholic priest and a Boy Scout, and 3 parachutes.
While the world's smartest man is telling everyone how smart he is, the 4 jet engines suddenly flame out, and the jet begins a sickening glide to the mountains below.
The pilot runs out of the cockpit, screaming, grabs a parachute, throws open the hatch, and jumps.
The worlod's smartest man says, "Listen, you two are just a worn-out old priest who says prayers and does other useless things, and a goodie two shoes kid. I, on the other hand, am the world's smartest man, and the world needs me, so..."
And before they can say anything, he pulls on a backpack, and jumps.
The priest says to the Boy Scout, "Well, son, it's only you and me, now, and there's only one parachute. What he said is half right -- I am a worn-out old priest, and you have your entire life before you. So, the parachute is for you!"
"That's okay, Father," says the Boy Scout. "That won't be necessary. The world's smartest man just jumped out of the plane with my camping backpack."