S.H.I.T.

Clara was riding the elevator when Tom got on and she, feeling rather friendly, said to him "T.G.I.F.!" in her most cheerful voice. He in turn stared blankly ahead and flatly replied "S.H.I.T."

At first she was pretty offended, but figured he didn't understand what she had said so she repeated a little louder "T... G... I.... F...!" This time he turned to look her squarely in the face and replied "S.. H... I... T...!"

Now she was angry. "T.G.I.F. stands for Thank God It's Friday!"

As the door opened and Tom was getting off the elevator he replied, "and S.H.I.T. stands for Sorry Honey, It's Thursday!".