I was at my favorite local bar on St. Patty's Day, having an Irish Coffee. (It was early in the morning) And someone walks in and asks what kind of green beer they have. The bartender/owner, whose a freind of mine answers. "What kind do you want?" Guy says "Coors light". The bartender goes "That's what we have". Not 5 minutes later the another person walks in and asks the same question and got the same response, to which he answers Bud Light. Bartender answers the "That's what we have".
After a minute or two he comes over and I asked him about it. He told me that the beer was actually keystone as they were the only ones who the distributor would allow to be pre-greened into the keg. He then said that anyone who would put green food coloring into a BMC beer wouldn't know the difference anyway.
He was right.