Oooh. Last question.
Too bad that yet again, Iris was drawn to a blank. GAH. Iris blamed the marshmallows. They made her lose her train of thought... and knowlege.
Thinking HARD, Iris tried to come up with a serious answer. (Because in all honesty, she wanted to say that it was good for protecting and hiding things, but she figured that was pretty immature for a prefect.) So instead, she just listened to all the other kids. And made mental notes.
Because mental notes were awesome.