Why Have FUN?
Trick question.
You can't NOT have fun. What you can do is unwit yourself of how much fun you're having all the time, even when you're sad, angry, or fearful, because you're really NOT those things.
Neither are you a noun or pronoun.
You are first a single verb: perceiving.
Then you are nothing, which is everything and beyond.
"I live on Earth at present, and I don’t know what I am. I know that I am not a category. I am not a thing — a noun. I seem to be a verb, an evolutionary process — an integral function of the universe."
R. Buckminster Fuller (1970)