For the ones who didnt know, there are probably some people who found out this trick:

http://imgur.com/a/lMSqZ

You need a flametrap, and make it as small as you can in width. the length depends on how long you want the laser to reach. And you can use rotate mode to aim. The best to do if you want to have multiple lasers is to use the copy option! 

Have fun!

Yeah, i think you should do that ;) 

The flame-lasers are really loud!