Lightbulb lights from Watermelon. I can't believe this actually worked. did you spot how it works? It is axtually a simple trick bulb, not the watermelon that lights it. It is a remote control with a battery that makes it light, but I put it in a watermelon to make the presentation of this trick more colorful and give it some flare. You can't really light.a bulb with a watermelon. do you like magic tricks like this/ | Adam Trent