Acronym Overuse

A woman hails a cab in NYC, jumps in and says to the cabbie. "T.G.I.F."

The cabbie just shrugs his shoulders and says, "Huh?"

She repeats, "T.G.I.F."

The cabbie thinks about that for a moment and says, "S.H.I.T."

Not understanding, she inquires about the meaning of the acronym.

The cabbie responds, "Sorry Honey, It's Thursday!"