Commentary vs. Instruction

I remember walking into the UC Berkeley undergraduate library. It was a while ago. Pfft, a long while. I had probably taken some LSD. Most probably. Inside the library doors was a sign that said "Library Entrance". Huh? We are already inside the library! Well, some local wit, I'm guessing a sardonic existentialist, not a ROTC guy, had scrawled the following words on the sign "the banality of this sign is out done only by the boredom which it seeks to preserve".

That is commentary. Biting. Satrical.

Of course I also remember that Emo Phillips said, "Some mornings it's just not worth waking up and chewing through the leather restraints".

That is instruction. More biting. More satirical.