A snowball quiz can be an ice breaker or quick assessment tool for a group of students the teacher may not have had previous relationships with. The way a snowball quiz works is that every student fills it out individually, they are then told to crumble it up and throw it in the middle of the room. They then go and pick up a different quiz -- its important that the quiz is not their own. The teacher will, in advance, have posted newsprint with the relevant quiz questions around the room on the wall. The students then go around and make tally marks for the quiz they have in their hand. The teacher finishes the exercise by going around the room and tallying all the important questions, pointing out what common ideas or experiences there are in the room, and what is not typical in the room. This helps the teacher to get a quick "read" on the audience of students. It helps students to reflect on an experience not their own, but someone who is relational to them in the room. And it helps students to see that perhaps their "normative" experience isn't all that normal or common. I find these really work well, but require a decent amount of people, and at least 20 minutes or so to do.