What was the most successful happy meal promotion to date?

The most successful Happy Meal promotion to date was arguably the 2010 release featuring toys from the popular animated film "Toy Story 3." This promotion created significant buzz and demand, leading to long lines at McDonald's locations as fans sought the collectible toys. The combination of a beloved franchise and limited-time offerings drove sales and increased foot traffic, making it a standout campaign in the history of Happy Meal promotions.