TGIF and SHIT

An attractive blonde and a handsome man step into the same elevator. The blonde sighs happily and says 'TGIF', and is surprised when the man replies 'SHIT'. The blonde thinks perhaps he didn't hear her correctly, so she repeats it once again: 'TGIF!' and once again the man replies 'S H I T'. Finally, the blonde explains 'Sir, TGIF - Thank God it's Friday!' Stepping out of the elevator, the man smirks and says 'S H I T - Sorry honey, it's Thursday.'