First Reactions to HP

My sister and I are both reading the Harry Potter series for the first time. Yesterday, we had this conversation:

Me: You're a Hufflepuff.
Sis: Thanks! [thinks] You're probably... a Ravenclaw, or... [long pause].
Me: Or a Slytherin?
Sis: [relieved] Yeah. I was totally going to say Slytherin, but I didn't want to hurt your feelings.
Me: You're such a Hufflepuff.