At Sydney University, there were four students taking Organic Chemistry. They did so well on all the quizzes, midterms and labs, etc., that each had an "A" so far for the semester. These four friends were so confident with the finals approaching that the weekend before, they decided to go down to Canberra and party with some friends there.
They had a great time. However, after all the hard partying, they slept all day Sunday and didn't make it back to Sydney until early Monday morning - the morning of their final exam! Rather than taking the final then, they decided to find their professor after the exam and explain to him why they missed it.
They explained that they had gone to Canberra to do some research in the ANU (Australian National University) archives for the weekend with the plan to come back in time to study, but, unfortunately, they had a flat tire on the way back, didn't have a spare, and couldn't get help for a long time. As a result, they only just arrived now!
The professor thought it over and then agreed they could make up their final exam the following day. The guys were elated and relieved. They studied hard that night - all night - and went in the next day at the time the professor had told them.
He placed them in separate rooms and handed each of them a test booklet, (which was out of 100 points) and told them to begin. The first problem was worth five points. It was something simple about free radical formation. Cool, they all thought in their separate rooms, "this is going to be easy."
Each finished the problem and then turned the page. Question 2 (for 95 points): Which tire?
A little boy and girl are in a bathtub, and are naked because they are too little too understand anything like that. The girl and boy ask each other: "What's that?" and they both reply: "I'll ask my parents."
So the boy goes home and asks his dad what it is. The dad looks solemnly at him and says: "Son, that's your car. You park it in a girls garage."
The girl goes home and says: "what's that?" The mother says: "That's your garage. dont let any boy park his car in it."
The next day they are again in the tub. The boy says its a car and remembers what his dad said. So he begins to put it in the girls "garage". But then the girl remembers what her mom said.
5 minutes later, the girl comes to the mom with blood all over her. The mother asks her what was wrong and she said: "Mommy, a boy tried to put his car in my garage, but I popped his two back tires."