Let the booing begin! Yes, it's that time of year. Classes are getting booed and booing others. What does that mean? Fun Halloween surprises are dropped off outside of a classroom. The recipient doesn't know who left the treats! The boo-sket of treats includes a sign that says "we've been boo-ed". That sign is put up outside the classroom so everyone knows who's already been in the receiving end of a booing. The new boo-ees then become boo-ers to two more classrooms to keep the fun going.