High five to hear a joke.
In April 2015, Cartoon Network invited people in Sofia to laugh with them, promoting the new episodes of "The Amazing World of Gumball" as well as the Month of Laughter on CN. An interactive city light was placed in center of the city, equipped with two motions sensors, that activated voice commands. One attracted all passersby to installation and the other prompted them to high five "Gumball" so to hear a joke. More than 200,000 people engaged with the ad and 4200+ interacted with the installation so to just have a laugh.