In classic Apple form, the company seemingly wants you to exclusively buy their earbud headphones for use with their iPhone as opposed to any other headphones you may or may not want to use. Flickr user vrogy has the scoop and the pic:

“It’s very simple- the curvature and insetting of the iphone housing prevents anything but very small audio plugs… i.e. mac hardware. Classic hardware lock-in.”

In a statement to Smooth Harold, Apple CEO Steve Jobs rhetorically asked, “We’d be stupid not to exploit and cash in on our insanely loyal consumer base, right?”*

*Steve Jobs really didn’t say this, but I can’t imagine the thought process being much different.