Another Blonde Joke

This blonde walks on to the elevator, smiles and greets the gentleman in the elevator and says TGIF. The man looks blindly at the blonde and replies SHIT. Confused (as usual) the blonde smiles again and says TGIF. The gentleman looks at the ditzy blonde and again replies TGIF. Determined, the blonde looks at the man and says TGIF, Duh, Thank God Its Friday and the man disgustingly says to the blonde, SHIT, duh, Sorry Honey Its Thursday.