lunar effect = lunacy

'Full Moons are traditionally associated with temporal insomnia, insanity (hence the terms lunacy and lunatic) and various "magical phenomena" such as lycanthropy (becoming a werewolf).' ~ excerpt taken from wikipedia

There have been many times during my career as a server that guests are difficult, but sometimes at the end of the evening you have to ask "what the heck happened?"  So often when a service goes completely wrong, when your ordinarily reasonable chef yells at every little mishap and the customers are unpleasant to say the least, it turns out to be a full moon.  On nights like this there seems no explanation other than the moon.  All the hype surrounding this most recent extra-large full moon didn't seem to help either. 

It's hard to put your finger on exactly what is different about the guests; they seems distracted, irritable, overly demanding and no matter what you do to give them great service the tip percentage during a full moon drops by almost half.  It's during this monthly phenomenon that people suddenly think it is okay to yell across the room at their server, to ask for a discount on their discounted food, to argue with the bartender over a free refill.  Even the most sensible people become little werewolves during a full moon: the coffee is too 'hot' - the soup not hot enough.  Everything is personal, the server is out to ruin your evening for sure!