Why, Exactly, Do I Need Instructions On How To Use A Pair of Headphones?

This is part of the “operating instructions” that came with the headphones I bought recently:

Seriously, it’s just a basic pair of headphones that I use to listen to my iPod.  And really, the only “instructions” are “Wear the headphone marked R on your right ear and the one marked L on your left ear.”  Thanks, Sony, I don’t know what I won’t have done without these fine instructions!