Five cannibals get selected as programmers in an IT company. During the welcoming ceremony the boss says: "You're all part of our team now. You can earn good money here, and if you are hungry, you can go to the company cafeteria for something to eat. So don't bother the other employees". The cannibals promise not to bother the other employees.
Four weeks later the boss returns and says: "You're all working very hard, and I'm very satisfied with all of you. However, one of our cleaners has disappeared. Do any of you know what happened to her?" The cannibals deny any knowledge of the missing cleaner.
After the boss has left, the leader of the cannibals says to the others: "Which one of you idiots ate the cleaner?"
A hand rise hesitantly, to which the leader of the cannibals says: "You fool! For four weeks we've been eating Team Leaders, Managers, and Project Managers so no-one would notice anything. Why you just had to go and eat the cleaner?!".
(Contributed by Luiz Barata)