I don't mind if one of my friends (or the cutie that sits next to me in health team relations!) messes with my hair--its usually in a messy bun by 4th block anyway. but if a stranger comes up and messes with my hair I'll face them and start messing with their hair. I have gotten several "WHAT THE HELL DO YOU THINK YOURE DOING?!?!?!?!?" so i politely reply "exactly what you're doing to my hair." and then they all turn bright red and murmur "excuse me" and power-walk away.