闲人

Remember the ABS (anti-boring system)? Basically, when you need to do some work, and you go play some crap game or watch some crap show, the reward you get:

Total reward = enjoyment from misc activities + removal of punishment

where punishment = whatever work you need to do

So there's an increased reward for whatever activity you decide to do, and whatever crap becomes more interesting say before an exam or assignment is due.

When there is no work
work = 0
therefore punishment = 0
therefore reward from removal of punishment = 0

New total reward = enjoyment from misc activities only.

Hence the same activity becomes more boring after the exam, because ABS does not work without the removal of punishment. (Q.E.D).