There is one teacher that sticks in my mind, I'm not going to name him - mostly because it's letigious. (I think...)
He was our humanities teacher back in secondary school (for 12-16 year olds) which is just a fancy word for "history / sociology" teacher. But I digress...
He seemed rather infatuated with a female student who had a habit of wearing a rather short skirt. (Bear in mind, we had to wear uniforms.) Every time she entered the room, he'd always leer at her longingly saying "Hello Alex, how are you today?" in the sleaziest and breathiest voice ever.
On one day, Alex was leaning back on her chair and while everyone knew exactly where this teachers eyes were. He even lampshaded this by saying "Oh Alex, you know how to make an old man very excited."
Being a child at the time, and all took place before there was a mass panic about paedophiles in Britain, me and my chum didn't report it. But it didn't stop everyone in the class from being REALLY grossed out by it.