This is CUTSIE WHUN, a balancing robot project in colaboration with Visuino developer Boian Mitov.
What you are going to see is a warning to the tinkerer community.
Double and Triple check your wiring in small complex robots.
What you will see is a capacitor pack failing inside his head
This was a simple error of plugging in the plug backwards to the power supply.
It is meant to provide some power stability to the RC radio receiver that is also in his head.