The following is an actual question given on a University of Washington chemistry mid-term:

"Is Неll exothermic (gives off heat) or endothermic (absorbs heat)? Support your answer with a proof."

Most of the students wrote proofs of their beliefs using Boyle’s Law (gas cools off when it expands and heats up when it is compressed) or some variant. One student, however, wrote the following:

First, we need to know how the mass of Неll is changing in time. So, we need to know the rate that souls are moving into Неll and the rate they are leaving. I think that we can safely assume that once a soul gets to Неll, it will not leave. Therefore, no souls are leaving. As for how many souls are entering Неll, let’s look at the different religions that exist in the world today. Some of these religions state that if you are not a member of their religion, you will go to Неll. Since there are more than one of these religions and since people do not belong to more than one religion, we can project that all people and all souls go to Неll. With birth and death rates as they are, we can expect the number of souls in Неll to increase exponentially. Now, we look at the rate of change of the volume in Неll because Boyle’s Law states that in order for the temperature and pressure in Неll to stay the same, the volume of Неll has to expand as souls are added. This gives two possibilities.

1) If Неll is expanding at a slower rate than the rate at which souls enter Неll, then the temperature and pressure in Неll will increase until all Неll breaks loose.

2) Of course, if Неll is expanding at a rate faster than the increase of souls in Неll, then the temperature and pressure will drop until Неll freezes over.

So which is it ? If we accept the postulate given to me by Ms. Therese Banyan during my Freshman year that "It will be a cold night in Неll before I sleep with you," and take into account the fact that I still have not succeeded in having sеxuаl relations with her, then (2) cannot be true, and thus I am sure that Неll is exothermic.

The student got the only A.
Two adventurers John and Jack were hunting for gold in the desert.
After roaming all day long under the hot sun, they set up their tent and fell asleep.
Some hours later, John woke up his friend.
"Jack, look up at the sky and tell me what you see."
Jack looked up and replied, "I can see millions of stars."
"What does that tell you?" asked John.
Jack thought for a minute and said.
"Astronomically speaking, it tells me that there are millions of galaxies and potentially billions of planets. Astrologically, it tells me that Saturn is in Leo. Time wise, it appears to be approximately a quarter past three. Theologically, it's evident the Lord is all powerful and we are small and insignificant. Meteorologically, it seems we will have a beautiful day tomorrow. What does it tell you?"
After a moment of silence, John spoke.
"It tells two things to me. First is that... you are an idiот."
Jack looked at John, surprised. "Why do you say so?" he said.
"Because it has still not occurred to you that someone has stolen our tent." replied John.
George and Harry out in a hot air balloon to cross the Atlantic Ocean.
After 37 hours in the air, George says "Harry, we better lose some altitude so we can see where we are".
Harry let's out some of the hot air in the balloon, and the balloon descends to below the cloud cover.
George says, "I still can't tell where we are, let's ask that guy on the ground".
So Harry yells down at the man "Hey, could you tell us where we are?"
The man on the ground yells back "You're in a balloon, 100 feet up in the air".
George turns to Harry and says "That man must be a lawyer".
And Harry says "How can you tell?".
George says "Because the advice he gave us is 100% accurate and totally useless".
That's the end of the Joke, but for you people who are still worried about George and Harry:
They end up in the drink, and make the front page of the New York Times: "Balloonists Soaked by Lawyer".