The guests each chose 3 skittles not knowing the reason. This is a fun game regardless of how well you know eachother, but also great as an icebreaker game. This could be used for a PD icebreaker, but change the meaning of the color to fit the lesson.
Students are given a little package (or just a couple) MMs, skittles,etc. and they can choose which questions to answer/share with the group based on the candy color. I like doing in small groups and then sharing out one of thing about each person.