Light bullets are not the deadly things their names make them out to be. They are, however, decidedly weird. To make a light bullet, researchers have to make a pulse of laser light that is continuously re-focusing itself.
Light beams can be super powerful, but they tend to scatter and lose focus over distance. Bullets are great for aiming at a far-off target, but tend to do a bit more damage than photons. What if you combined the two? You'd have light bullets, which sound like science fiction, but are very recently real.