A blonde smiles sweetly as the gentleman joins her in the elevator. "TGIF" she bubbles.
He looks at her calmly and says, "SHIT".
Indignant, she replies, "T.G.I.F."
Pointedly he again replies, "S.H.I.T."
"Well," she says, "T-G-I-F. Thank God it's Friday."
"S-H-I-T. Sorry, Honey It's Thursday!"