When the mere sound of the printer invokes an irrational response.
Rational mind: My colleagues need to print documents.
Irrational mind: Omg, someone's printing again? I'm so tired of that noise! And why is it always these 80 pages reports that just won't stop? Should I just record that sound and loop it on my iPod? Is that the sound I'm destined to hear for the rest of my f@#$ing life?! Can't you people stop f@#$ing printing sh#% for two minutes?!?