Brain Day
The art of training your mind to be less idiotic. Just like working out your body at the gym, you need to get in your mental reps or else you will become a moron. Not observing brain day could result in bodily harm, embarrassment, death, or all three at once.
Hey did you see Jamaraquay try to ride a bike on a treadmill? He must've skipped brain day.
bad brain day
A day when nothing anyone says to you makes sense, nothing you say makes sense to anyone else (including yourself), following directions proves problematic and items which should be readily locatable cannot be found (or are found only after much searching on top of one's head).
I knew it was going to be a bad brain day when I finally located my keys in the drawer where I always keep them, my glasses on top of my head, and remembered only after entering the now empty garage that my wife had earlier mentioned that it was her yoga day, which meant she was taking the car.