What to do when the shh hits the fan...?

As you all know sales may or may not be one of the best jobs ever and those who develop a real passion for it know what I'm talking about. However, whenever you have one of "those days" where everything seems to go wrong no matter how great a mindset you have (like all of us who thrive in this insane world must retain) what do you do to relax? How do you vent? How do you cope? How do you recharge the good ol' sales fuel batteries? Advice, please!!!