Is it normal that i think such thoughts?

So like... Is it normal that I think these thoughts? I'll just give you one minor example to give you a gist of the thoughts I am talking about.

So lets say one day I'm walking into my bathroom with this urge to pee. As I unzip my zipper and let little (we'll call him Juan for now) Juan free from the depths of my pants, I see this one insect on the wall each time I enter the bathroom. It just stands there on the wall, menacingly. It stares at me as if it were going to battle me. I continue what I was going to do though because I have to take care of business. As I stand there though, I get this thought. This thought branches off into two directions (which I will discuss in a bit.) But this thought basically involves that insect and the stream of pee that goes from my penis to the water in the toilet. We'll call this stream "Franklin." So back to the two branches. One branch from my thought is thinking: "Hmm.. If that insect were to fly towards Franklin, I believe that insect would collide with Franklin, but safely make it and continue with its day." The other branch of my thought would be like: "HMMMM... But, wouldn't the momentum and inertia of Franklin's dive into the water simply take the insect down with him like a football player tackling a nerd?"

Now you see, the situation where the insect and Franklin come in contact never happened, so my mind always wonders that.

That is just one thought, but you get the idea. Is it normal to think these things?