True Story: -Engineers at my school had to take 15 units of Arts courses as part of their studies, and Economics 100 was one of the popular choices. We had an Econ 100 class that matched a hole in the 3rd year mech and EE schedule, as a result we had about 2/3 engineers and 1/3 Arts students.
One day the prof, a very smart man with a subtle sense of humor, drew a graph of some function on the board. He drew the x and y axes, a straight line with a 45 degree slope and labelled the x intercept "a" and the y intercept "b". One of the girls from Arts puts up her hand and says "I don't think it should be that steep". The prof erases the line, redraws it half as steep and labels the x intercept "a" and the y intercept "b". "How's that" he says."Much better" says Arts girl.
Every engineer in the place falls over laughing. We laugh even harder as we see the confused look on Arts girl's face as she tries to figure out what's so damned funny. The prof never cracks a smile.