October is Breast Cancer Awareness month. Yoplait supports this initiative by offering containers with pink lids. When you mail these in, they will donate $0.10 per lid to the Susan G. Komen Foundation.
Right now, they are offering a coupon for $1.00/1 4-pack of any product that has these pink lids in hopes you will purchase and mail them in to help this amazing cause. You can print it through IE here or Firefox here.