This sums up Onizuka's teaching style because you never know.
Eikichi Onizuka isn't your typical teacher. He is an ex motorcycle gang member, has ear piercings, dyed blond hair, picks his nose and scratches himself in public wear he probably shouldn't and is more immature than his students. His enemies hate him and his friends think he is an idiot yet somehow he comes out looking good and you never know if he means it or not or if he is highly intelligent as is sometimes suggested or as stupid as he appears.
He is given the most difficult class to teach at the private Holy Cross Forest Academy who have forced to quit a string of teachers but they have met in Onizuka their most difficult challenge. Despite their scheming he slowly wins them over and gains their "respect".
He does this by helping them with their problems outside of school and their insecurities whilst teaching them about life normally by some grand gesture such as getting shot by Yazuka or jumping of a bridge with one of students on the back sometimes with the help of his questionable friends. Otherwise he just takes his students out of school on extra curricular activities which he really, and I mean really, shouldn't.
What makes GTO great is that for such a large cast the characters are developed well much of it done with out Onizuka in the scene so the anime is not overly dependent on Onizuka especially when it comes to the students. The students problems are also believable such as bullying, dealing with an abnormal intellect making you smarter than the teachers, a father having an affair or a friend committing suicide.
All in all GTO is a classic anime with a great stories and great character. Unfortunately the animation now looks a bit dated but it compares much better than a lot of anime's of its time.
One negative note though, I have to say I didn't like the ending.
