I guess I see it differently. I don't see it as they were set up to be disappointed, I see it as they were set up to learn a lesson. The tirick didn't last a week. The ASSUMPTION and RUMOR from snooping kids lasted a week. The teachers did not play a video and then a week later say.. haha, just kidding. They didn't announce a trip at the beginning of the year , plan events and then tell them it was a joke. The teachers slide show with the "trick" was just that. A slide show that started about the trip and ended with the realization there was no trick.