Launched last year in Japan, the Pikachu Outbreak is a massive event in tribute to the most famous Pokemon, with literally an army of giant Pikachu that invades the different locations of Yokohama. On the menu of the Pikachu Outbreak 2015, parades, concerts, dances, exclusive Pikachu merchandise, activities for children but also for adults, and especially an avalanche of yellow (no, no Minions here I assure you). The word you are looking for is probably WTF. The Pikachu Outbreak 2015 takes place from August 8th to 16th in Yokohama, southwest of Tokyo. See also the Pikachu Outbreak 2014.
Images © Pikachu Outbreak 2015