It’s not a laser but it will definitely do some damage. Youtuber Allen Pan who runs a channel called ‘Sufficiently Advanced’ where he turns fictional objects and tries to make them into real life things. A few weeks ago he made Thors hammer and now he’s created the most amazing thing, a real (butane) burning lightsaber just in time for the opening weekend of Star Wars A Force Awakens! Check out the video of how he created it and how it works!