Bad things happen on Fridays. I just looked up a few of them. For instance, Peter the Great imposed a tax on beards on a Friday. Squeaky Fromme tried to shoot President Ford on a Friday. John Roberts was nominated for the Supreme Court on a Friday. On the Road by Mister Jack Kerouac was published on a Friday! And those are all just some of the things that happened on just the Friday, September 5ths throughout history! Imagine if you look at all the other Fridays how many that multiplies out to. (Um, upon fact-checking, I realize that I have it wrong; all those things happened on September 5th, not necessarily a Friday. But I'm not re-researching; that's for the lovely people at Alfred A Knopf or the kind gentlemen at Farrar Straus and Giroux to do. Hint hint.)
One thing I do have right is that you should never ever ever go to lunch with the boss on a Friday, especially if the boss initiates it. If such an invitation comes your way, I am here to tell you that you are about to be fired. This very thing happened to an old boss of mine just a few years ago, when her boss called her at home and asked if she'd meet him for lunch at a very fancy restaurant later in the day. Now my boss was a smart lady and she said "are you going to fire me?" and her boss said "we'll talk at lunch" and my boss said "fuck that; if you're gonna fire me, I don't want lunch...I want the fifty dollars lunch was gonna cost." She ended up falling in love, moving to Louisville and going to the Kentucky Derby, where she hit the trifecta or the doubledown or the quadraplegic or whatever it is those gambling addicts call that stuff. So you see, skipping lunch really pays off.
I myself never even bother going to work on Fridays just to avoid getting fired. So don't say you never learned anything from the Psychopedia.