When answering this question, you can discuss different attitudes people have toward others accidentally appearing in their photos. Some people might not care because they see it as a natural part of taking pictures in public places, or they might even find it interesting or funny. Others might be more particular and want their photos to be perfect, so they get annoyed if someone walks into their shot. You can also mention that it depends on the situation—if it’s a casual photo, people might not mind, but for special occasions, they might care more. Giving a personal opinion or example can make your answer stronger.