When I DO know the material, I actually kind of like them. They give me a buzz, oddly enough. In high school I wrote a biology exam and after I left, one of the teachers asked me who my Biology teacher was.

"So who's your biology teacher?"

".... uhm.... what's his name...."

"Mr. Lee?"

"... ye...ah... that's it..."

"He's your uncle. How can you not remember his name?"

"..."

It's such a weird feeling! XD