First rule

The first rule of a graduate researcher that wants to have a quite, relaxed, mediocre research life is this: NEVER EVER tell your supervisor that you finished what you had to do BEFORE your supervisor asks you about it. Because if you do tell him/her that you finished ... well ... your supervisor will not say "Good on you, take the rest of the week off!" but will definetly give you something new and exciting to do :).