you go to the drive thru menu board thing and say, "yeah, my friend came here a few minutes ago, and you left (insert the food you want here) out of the bag. And tell them the person who got the food earlier called you on their cell phone and are on their way home but you don't have a receipt. they might ask you some more questions, answer them to the best of you ability. eventually they will probably give you the free food. try this at many different locations for the best results.
