Well, this is the thing about lists, you never know when I'm going to prattle on so much in a reply that it creates a post in itself. First Slughorn, now...this. But I thought it was interesting because recently I know I was talking to somebody about why Occlumency and throwing off Imperius were so different and why Harry sucks at one and is good at the other. I was reading a discussion about Harry's greatest strengths and weaknesses (does he need to learn to keeps his mind shut like Snape says?) and it got me around to seeing what may be the difference.
( Occlumency vs. Imperius, Slytherin vs. Gryffindor )
( Occlumency vs. Imperius, Slytherin vs. Gryffindor )