McDonald's is going back to its tried and true way to celebrate Halloween. The fast-food giant earlier this month announced on social media that Halloween Happy Meal pails will return to restaurants.McDonald's first introduced the pail set featuring McBoo, McPunk'n and McGoblin back in 1986. The company said the trio will be back in participating restaurants nationwide starting Oct. 18. Customers will be able to buy a Happy Meal pail through Oct. 31 or while supplies last.