At Least There's CSI

A business man got on an elevator.
When he entered, there was a blonde already inside.
She 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".