A Bright Bouncing Boy

 is a Stranger mission in Red Dead Redemption II. The quest becomes available during Chapter 4.

Story
Professor Maro Dragic can be found sitting on a pond in Saint Denis having an outburst. After being introduced, he recruits the protagonist to help him with a new remote-controlled boat that he wishes to showcase for investors. When the investors arrive, they ask that someone with no understanding operate Dragic's machine. The protagonist decided to help. Once the boat is in the water, the machine operates entirely on radio waves and electricity. The pond is full of mines that must be avoided and battleships that must be sunk. During the showcase, Dragic discusses just how remarkable his breakthroughs are. After the first wave is destroyed, Dragic sets in new battleships that move around the pond and are easier to sink. After the demonstration, the spectators are impressed by the potential of Dragic's inventions.

A few days later, the protagonist can visit Marko Dragic's workshop located in the northeastern corner of the map during the night time to continue the mission. The professor is worried that someone is coming to rob him and speaks to the protagonist through a microphone while in hiding. He tells the protagonist to take three metal rods outside and try to capture electricity from the thunderstorm outside. Once all three rods are placed, the protagonist must climb to the top of a metal tower and flip a few switches to initiate the capture. It turns out Dragic wishes to use the electricity to power his own robot. The experiment begins and the robot takes a few steps forward before collapsing. Regardless, the Dragic is happy with the results.

A few days later, the protagonist can visit his workshop again to see his fate. Dragic can be found dead in a pile of blood inside of his home. By venting outside up on the mountain, you can find his robot sitting in the snow. Quietly mumbling "Papa" to itself over and over.