T-G-I-F VS S-H-I-T

A business man got on an elevator. When he entered, there was a blonde already inside who greeted him with a bright, "T-G-I-F."

He smiled at her and replied, "S-H-I-T."

She looked puzzled and repeated, "T-G-I-F," more slowly.

He again answered, "S-H-I-T."

The blonde was trying to keep it friendly, so she smiled her biggest smile, and said as sweetly as possibly, "T-G-I-F."

The man smiled back to her and once again, "S-H-I-T."

The exasperated blonde finally decided to explain. 'T-G-I-F' means 'Thank God, It's Friday.' Get it, duuhhh?"

The man answered, "'S-H-I-T' means 'Sorry, Honey, It's Thursday'-- duuhhh.