I was a curious kid growing up, my mom would say “I need to change my oil” I would ask “why” and she would explain. With the meme I was bored and had a long car ride and this was the first thing that came to mind. And when I would ask questions growing up they were either because I didn’t know( i.e. why cars need oil ) or because of the situation i.e. vacuum your room, why, guests are coming over.
And criticizing this joke is like criticizing the chicken crossing the road joke, saying “ well the chicken should be kept in a pen” I’m a kid, it’s a joke, I explained the joke to you, get over it.