It was recenly found that shouting at harddrives decreases their performance. Simply put harddisk drives do not like being shouted at anymore than you do.
Brendan Gregg demonstrates in the video below, how shouting at the diskdrives decreases the performance of the drives. Of course the expenation is not that the drives dislike being shouted at, or loose their focus and start worrying about being good enough, dresses up in goth clothes, hates the world and becomes an underacheiver… uhmm no.
Sound is vibrations, and shouting at the drives simply causes vibrations that affect the drives an decrease performance. Simple as that, but still interesting. At least i found so 🙂
Also a funny sidenote i found this video of Justin Long (from various Mac commercials).