Don't let anyone tell you otherwise; highlighting a character's crotch on-screen at the movies is hi-larious, and always will be. But getting caught with a laser pointer in your hand and tossed out of the theater isn't. So thankfully red lasers have been around for decades, and have been miniaturized to the point where they can hide inside your smartphone's headphone jack.
Designed strictly for safe work purposes like highlighting information during a presentation, the iPin sips power from your iPhone but shouldn't drain its battery unless left on for endless hours. Speaking of which, the laser is activated using a free accompanying app, and it even has a safety to ensure it can't be accidentally turned on when you don't need it. You just turn the laser 90 degrees when it's inserted in the headphone jack and it will remain inert until you turn it back.
At just over $40 it is considerably expensive given red laser pointers are almost as cheap as penny candy these days. But what you're mostly paying for here is a covert way to harass and annoy people. Note: please don't harass and annoy people with this. [iPin via The Gadgeteer]