In the promotion of the 20th anniversary for Kirby; an attempt was made to have the largest number of people blowing bubble gum bubbles at the same time. The record was broken from 304 to 536 people in the queue room at PAX Prime 2012.
Source: dabolo
Kirby World Guinness Records PAX 2012 from dabolo on Vimeo.
Source: NukezillaVids
Source: PeteDorr