Q: How do you punish a blind person?
A: Give them a gun and tell them it's a hairdryer.
Alright listen up, buttercup. So, the joke here is that you trick a blind person into thinking a gun is a hairdryer, and then they accidentally shoot someone! Classic switcheroo! If you're so dumb that you found the author funny, you may need to see a doctor, or a therapist... or maybe just a really good teacher.