General Mills and Got Milk? Team Up for Limited Edition Milk Mustache Cereal Boxes ✖ Hot off the heels of announcing over a dozen new cereal products, General Mills is starting the new year off with a bang. The cereal maker announced Tuesday morning it's partnering with the got milk? campaign to launch a line of special edition cereal boxes featuring the brand's most iconic characters with milk mustaches. Launched by an advertising agency in 1993, you've seen got milk? ads plastered in magazines, comics, and other print materials — now they're coming to the boxes of staple cereals like Trix, Lucky Charms, Cocoa Puffs, Cinnamon Toast Crunch, and Honey Nut Cheerios.