Lightblubs that glow in the dark when turned off...

Glo Lux's patent-pending, non-radioactive full spectrum light bulbs actually glow in the dark for up to an hour after the light or the main power supply has been shut off. This is very handy in cases where the power is cut due to an environmental catastrophe, or other emergency circumstances.

The website talks about the 9/11 bombing at the very beginning as a "reason" for the light bulb's creation but all is forgiven if the product actually works, isn't harmful to humans [their site says that they're safe], doesn't cost too much and if it actually lasts at least as long as a standard light bulb.

Here's the link.