Physics Teacher: "Isaac Newton was sitting under a tree when an apple fell on his head and he discovered gravity. Isn't that wonderful?"
Student: "Yes sir, if he had been sitting in class looking at books like us, he wouldn't have discovered anything."
You enter the laboratory and see an experiment. How will you know which class is it?
If it's green and wiggles, it's biology.
If it stinks, it's chemistry.
If it doesn't work, it's physics.
Don't LOOK at anything in a physics lab.
Don't TASTE anything in a chemistry lab.
Don't SMELL anything in a biology lab.
Don't TOUCH anything in a medical lab.
and, most importantly:
Don't LISTEN to anything in a philosophy department.
The elephant asked the camel: "Why do you have your breasts on your back?"
The camel clearly irritated by the outrage of modesty replies: "What a silly question from someone who has a dick on his face."