Freudian slip:  Named after famous psycho-analyst Sigmund Freud, is when a slip of the tongue occurs when a word that the speaker was subconsciously thinking about is substituted for the one that he or she meant to say.

Two business men were having a chat over coffee.  One says to the other, “Man, I had the funniest Freudian Slip the other day at the bus station.  I wanted to ask the lady at the ticket counter for 2 tickets to Pittsburg but instead I asked for 2 pickets to Titsburg!”  The guys laughed before the other man replied, “Man, that’s nothing.  My wife and I were having dinner and I wanted to say honey, would you please pass the salt?  Instead I said, Bitch you ruined my life.”