Glow Brick: Too Cool
Speaking of presents, this Glow Brick from ThinkGeek will probably be a better choice than the Jade East you're considering at the drugstore* although the true geeks in your life might appreciate both.
* It was recently brought to my attention that many readers may not be familiar with Jade East. Here's a link as a public service for nostalgia nuts. You'll find a few other ancient scents that can take you back to the Sixties while clearing out the nearest elevator.