Daniel Hashimoto is a special effects guy in Hollywood who worked on "Kung Fu Panda 2".  But he also adds effects to videos of his THREE-YEAR-OLD SON.  The two most popular ones feature a lightsaber and a Batman-style grappling gun.

 

 

(Search for "Action Movie Kid - Toy Lightsaber" and "Action Movie Kid - Grappling Gun."  There's a YouTube channel called "The Action Movie Kid" where you can watch them all.)