A company manager was told one day that he had to make one of his staff redundant. He decided that he could probably afford to get rid of either Jack or Jill as they performed similar roles. He decided that over the next few days he would see who was the better worker. Jack came in on time every day, worked hard, did a good job and left work late. Jill came in late, talked half the day, worked half-heartedly and left early. After a few days the boss called Jill into his office. Jill had come in late that morning and looked hungover. The boss said.. "This is difficult to say, Jill. I have had to make a decision as to whether to lay you or Jack off." "Well you had better jack off", said Jill, "because I have a headache."