What do i say??......... Plz help me. 10 POINTS.?

I m going to get my hair shaved because i got scolded by the principal of the school. My hair was longer than Zac Efron. The principal said that i m allowed to keep long hair like Zac Efron but no longer than that.. When i get my hair shaved, my friends will get surprised and they will ask me what have u done with ur hair or why did u shave it or they will say Oh my god or Holy Crap so what is the most funniest thing to say to my friends when they ask these questions. NO BAD WORDS.