My Sweet Rabid Squirrel

My son is normally a peaceable, wonderful, sweet, pleasant person, but when I come at him to give him a haircut, he turns into a rabid squirrel, squirming and whining and running away and hopping around. What is so difficult about having a haircut???? I'm hatching a plan to make him save his own money to pay for a professional haircut if he can't act like a human when I give him a haircut.