Busy restaurants are bee hives. They are full of people coming and going, animated conversations and more distractions than the human mind can process. The attention span of most people is already limited so the more you can cut down on distractions the longer you can keep someone's attention. When dining with clients, always choose the seat that puts your back against the wall and give clients the seats facing the wall. This limits the amount of distraction and allows clients to focus on you and the conversation.