맥도날드에서 버거를 사려고 줄을 서고 있었는데 어떤 분이 해피밀 장난감 사진을 찍으려고 하더군요. 그런데 직원이 내부촬영은 다 안된다고 말했네요... 왜 내부촬영이 안되는 걸까요?