Boss: "You're part of our team now. You'll earn good money and can go to the cafeteria for something to eat. So don't trouble the other employees".
The cannibals promise. 4 weeks later the boss returns.
"You're all working very hard. I'm very satisfied with all of you. One of our cleaners has disappeared, however. Do any of you know what happened to her?"
The cannibals disavow all knowledge of the missing cleaner. The boss leaves.
Cannibal leader: "Which of you idiots ate the cleaning lady?"
A hand raises hesitantly.
"You fool! For 4 weeks we've been eating Team Leaders, Division Chiefs and Project Managers so nobody would notice anything, and you have to go and eat the cleaning lady!"