Mcdonalds celebrates National Breakfast Day by giving out the famous McMuffins for FREE! McDo will help you start your Monday morning right. To avail just drop by the participating McDo branch on March 18, 2013 from 5AM - 9AM. The first 1,000 customers needs to get a coupon from the staff inorder to claim the FREE McMuffin. Strictly 1 coupon per customer. You may claim via Dine-In, Take-Out, or Drive-Thru. For some stores, only 500 McMuffins will be given away starting 7:30AM.