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.

A young man goes into a drug store to buy condoms.
The pharmacist says the condoms come in packs of 3, 9 or 12 and asks which the young man wants.
"Well," he said, "I've been seeing this girl for a while and she's really hot. I want the condoms because I think tonight's "the" night. We're having dinner with her parents, and then we're going out. And I've got a feeling I'm gonna get lucky after that."
"Once she's had me, she'll want me all the time, so you'd better give me the 12 pack."
The young man makes his purchase and leaves.
Later that evening, he sits down to dinner with his girlfriend and her parents.
He asks if he might give the blessing and they agree.
He begins the prayer, but continues praying for several minutes.
The girl leans over to him and says, "You never told me that you were such a religious person."
The boy leans over to her and whispers, "You never told me that your father is a pharmacist."
Wilson runs a nail factory and decides his business needs a bit of advertising. He has a chat with a friend who works in marketing, and he offers to make a television ad for Wilson's Nails.
"Give me a week," says the friend, "and I'll be back with a tape."
A week goes by and the marketing executive comes to see Wilson. He puts a cassette in the video and presses play. A Roman soldier is busy nailing Jesus to the cross. He turns to face the camera and says with a grin, "Use Wilson's Nails, they'll hold anything."
Wilson goes mad, shouting, "What is the matter with you? They'll never show that on television. Give it another try, but no more Romans crucifying Jesus!"
Another week goes by and the marketing man comes back to see Wilson with another tape. He puts it in the machine and hits play. This time the camera pans out from a Roman standing with his arms folded to show Jesus on the cross. The Roman looks up at him and says, "Wilson's Nails, they'll hold anything."
Wilson is beside himself. "You don't understand. I don't want anything with Jesus on the cross! Now listen, I'll give you one last chance. Come back in a week with an advertisement that I can broadcast."
A week passes and Wilson waits impatiently. The marketing executive arrives and puts on the new video. A nакеd man with long hair, gasping for breath, is running across a field. About a dozen Roman soldiers come over the hill, hot on his trail. One of them turns to the camera and says, "If only we had used Wilson's Nails!"