classroom sleeping

i was in my linear programming class today (what? taking LP your final semester? yes, i'm a bad planner) and i was just thinking that the class was starting to get interesting. anyway, two students in the back row happened to have fallen asleep. unfortunately for them, the classroom is really small, and the back row is the third row. and by "fallen asleep" i mean all-out, head resting on the table, and out like a light. the professor noticed this and decided to start asking the two sleeping students questions like "are you tired?" and "do you find these problems boring?" at that point, the students woke up. unfortunately, they were unaware that they had been addressed by the professor and executed the "i'll just stare at the white board and my notes so it looks like i was paying attention" strategy. now generally, this strategy works. unless of course, the professor asked you a question and the entire class is staring at the sleep creases on your face.

i of course, laughed at them. as long as it doesn't happen to you, it's funny. right?