Thanks for your reply Mister Micawber.
I was just wondering since both verb forms are okay, do you reckon the '-ing' form (be going to his brain) would create a greater sense of action? Or it wouldn't make a difference.
I'm glad you found my joke funny ; ) I actually got the idea for this joke just today when something reminded my of a news report on North Koreans being advised to wear their hair in a certain way with reasons including the one in my joke. I guess it was most likely the absurdity of this justification and debasment on the individual's rights that made me able to recall it after such a long time. The internet told me this was made news around the beginning of 2005. Here is a link to a report run by the BBC on this event if you are interested.
N Korea wages war on long hair
I have not yet thought up of an appropriate situation to share this though. It would just be too hurtful if I was not able to make it sound like a joke.
PBF