A guy gets on an elevator & there stands a blond...she smiles & says to the guy, "T.G.I.F."
He says "S.H.I.T."...
She giggles & says again, "T.G.I.F."
He says, "no, S.H.I.T."
Smiling, the blond replies, "no, T.G.I.F, Thank God it's Friday"...
To which he replies, "S.H.I.T., Sorry honey, it's Thursday..."