iSight trick
Back in the day, you really couldn’t call yourself a web-master unless you’d sent a few “newbies” to a web page that said something on the order of “I can see all your files,” followed by a link to “file:///“. I figured that joke had died a long time ago, but recently I came across a new variation that uses the iSight or other firewire connected camera on a Mac.

Yeah, it’s more prank than hack, but it does serve as a quick intro into some of the cool things you can do with Quartz Composer and OS X. It’s also motivated me to shave, comb my hair and wear proper attire before sitting in front of my computer, so perhaps it’s an appropriate and on-topic life hack after all… – Link.