A business man got on an elevator in a building.  When he entered the elevator,
there was a blonde already inside and she greeted him by saying, "T-G-I-F"
(letters only).

He smiled at her and replied, "S-H-I-T" (letters only).  She looked at him,
puzzled, and said "T-G-I-F" again.  He acknowledged her remark again by
answering, "S-H-I-T."  The blonde was trying to be friendly, so she smiled her
biggest smile and said as sweetly as possibly "T-G-I-F" another time.  The man
smiled back to her and once again replied with a quizzical expression,
"S-H-I-T."

The blonde finally decided to explain things, and this time she said, "T-G-I-F,
Thank Goodness It's Friday, get it?"  The man answered, "Sorry, Honey, It's
Thursday."