The normal reaction to a laser is panicked fleeing, because it's either a sniper, the aliens attacking, or someone giving an annoying power point presentation. But cats say, "Fuck that, we we have claws and sharp teeth, we're not scared of shit," and they hunt that laser down like they're starving and charbroiled laser is on the today's lunch menu. Not only will cats chase lasers, but they'll do it for hours, until their little cat lungs can't take it anymore or they've finally realized that lasers may be the only things in their goddamn house they can't kill. Only cats have the courage, the tenacity, the persistence, the agility, and the fascination with bright things necessary to chase lasers. You find me a human who'll scale vertical surfaces for a moving red dot, and I'll find you a human who's had his brain replaced with a pound of catnip.
(flickr photo Kittens! by Ingorrr; http://www.flickr.com/photos/ingorrr/441645263/)