As we all know, Severus Snape was sorted as a Slytherin when he was eleven years old. But, I sometimes question that sorting. I don't entirely believe that Sev should've been a Slytherin, but I can't think of any other house he definitely belongs in...
Lets look at the house choices and what would make Sev fit into them...
Slytherin: He had an obsession of the Dark Arts, and a certain respect for wizards who mastered them. He also had a fondness for the Pure-Blood superiority suggestion. And, of course, later in his life, he became a "faithful" servant of the Dark Lord and Death Eaters.
Gryffindor: Sev undoubtedly has a profound and deeply rooted bravery. We have seen this revealed by the constant danger he puts himself in to protect his dearly beloved, Lily's, son, Harry Potter. Most of his actions are also driven by his undying love for Lily. I also think of Snape's memory of Dumbledore telling him he was brave for putting himself in danger, and then leaving with the statement, "You know, sometimes I think we sort too soon..." I took this as Dumbledore saying Snape had the potetial to possibly be in Gryffindor house.
Ravenclaw: Severus also has a razor-sharp mind and wit. He is very clever, which is apparent in the many spells he has invented under the pseudonym "Half-Blood Prince." He also has the ability to look at all situation in a practical light. For instance, when Dumbledore was cursed by the Ring of Gaunt, Sev didn't freak out and emotionally break down. No, he kept a cool head and speedily applied his skills. Also, he believes that logic can sometimes be more powerful than use of magic. For instance: his "protective charm" on the Sorcerer's Stone was a logic puzzle, only to be figured out by someone with an equally sharp mind. In this case, Hermione Granger.
I don't see him being in Hufflepuff at all though.
These are just my takes on it. Please, comment and share your ideas. Which house do you think Severus Snape should've been sorted in?