Why does bacon sizzle

 "We don't have a theory of something being easy to do or of things going according to plan, things working out. Theory means something is difficult."

            "I wonder why bacon sizzles in the pan. What is it that's vibrating? I understand why the drum head vibrates and moves the air inside, but not the bacon." 

                            "There is a theory of poetic language, it might be wrong or right, but there is a theory of it, or several. But we have no theory of language not being poetic, the absence of whatever that is that is 'poetic."

                            "Why do we need that? We only need to know about the difficult cases, like the bacon. I literally do not know why it sizzles, yet it seems dumb to ask. When we understand, we move on, or so I'd thought."

                    "That what I'm saying, we have it wrong. Easiness is difficult to understand. We don't know how those easy things occur."