Contrary to Israel's post on Wednesday, May 16, 2007, unicorns do have the ability to defeat some lasers:
But the lasers used in this clip are of the magic variety, not mechanized. Mechanized lasers would incinerate a unicorn:
If unicorns had any sense, they'd develop the ability to shoot lasers from their horns. But they didn't, and natural selection took its toll: the magic lasers evolved into mechanized lasers and effectively hunted unicorns to extinction.
In the future lasers will: eat for us; cook for us; love for us. Currently, there is nothing you can do that a laser cannot do more efficiently.