Recipe: You take one portable RPL-300 Green Laser (around 316mW power output) and then you inflate 20 balloons or so until you start getting dizzy or bored (whichever comes first). You put the 20 balloons in a row, in front of the laser. The result is clearly visible in this video!

P.S: As an alternative you can replace it with a several MW laser, add a tracking system to it, and call it an anti-rocket shield!