Went through drive thru and bought soda with my food. Soda tasted like lemon. Went back and had to park and walk in to get new soda. Girl acted like I was crazy. She opened the lid and looked at it and said, that's definitely Coke. Although I won't doubt her keen eye, I told her that it tasted lemony. She reluctantly gave me a new drink. Not much better so I ended up tossing it. Waste of money. This did happen to me about 9 mos ago at the same BK but I though it was a fluke. My mistake.