I loved my seventh grade science teacher. I think he had ADHD or something similar, and he warned my class on the first day that "our period is about the time his medication starts to wear off". He'd take the class to work outside on nice days, and on one windy day he ran around outside the school screaming "I'M KING OF THE WOOOOORLD!!!1". I remember he also came completely decked out as Snape for Halloween one year, and acted like him all day and everything. xD
...but, he had strange ways of disciplining us. He had a hammer, and when we got too loud, he'd bang it on a wooden table, making an extremely loud noise that scared the crap out of all of us. And, according to him, every time you're startled like that in a way that disturbs your heartbeat, it takes approximately one second off your life. He said that if we were going to waste his time in class, he'd just take time off our lives. D: