In an effort to add diversity to the workforce, five cannibals get hired by a large school district.   During the welcoming ceremony the superintendent says, "You're all part of our team now.   You can earn good money here, and you can go to the cafeteria for something to eat.   So please don't trouble any of the other employees".

The cannibals promised.

Four weeks later, the superintendent returns and says, "You're all working very hard, and I'm very satisfied with all of you.

However, one of our janitors has disappeared.   Do any of you know what happened to him?"

The cannibals all shake their heads no.

After the boss left, the leader of the cannibals says to the others, "Which of you idiots ate the janitor?"

A hand rises hesitantly, to which the leader of the cannibals replies, "You FOOL!   For four weeks we've been eating Assistant Superintendents, Curriculum Directors, Team Leaders, Supervisors and Coordinators and no one noticed anything, and YOU had to go and eat the janitor!"