ADHD and a Lightbulb

Listen up, you smooth-brained joke teller. You asked how many ADHD kids does it take to change a lightbulb. You probably thought there was going to be some story about how they would be disorganized and forget to buy a new one. The punchline doesn't answer the question at all, it just has the kid getting distracted by something shiny and wanting to go ride a bike instead. It makes no sense, which is the point.