I wish to see Severus Snape suffer greatly

Not in the "he's my favorite character way" but rather in more of a bashing way. Also bonus points if tortures involved or if he gets karmic justice for being such a back of dicks. Extra bonus points if Harry's the one getting karmic revenge on Snape or is just torturing him after he goes a bit too far (I especially need this one). Please drop links to any fics like that please.