Cannibals in your office…

A big corporation hired several cannibals. “You are all part of our
team now,” said the HR manager during the welcome briefing. “You get
all the usual benefits and you can go to the cafeteria for something
to eat, but please don’t eat any of the other employees.” The
cannibals promised they would not.
A few weeks later the cannibals’ boss remarked, “You’re all working very hard, and I’m satisfied with you. However, one of our secretaries has disappeared. Do any of you know what happened to her?” The cannibals all shook their heads, “No,” they said. After the boss left, the leader of the cannibals said to the others angrily, “Right, which one of you idiots ate the secretary?” A hand rose hesitantly in admission. “You fool!” said the leader, “For weeks we’ve been eating managers and no one noticed anything, but noooooo, you had to go and eat someone important!”