So I did , and he headed over from Mayfair to join us in a pub at Waterloo . The three of us spent until closing time chattering away about a load of stuff and we all had a really great night . Anyway , I 'll cut the next part of the story for the sake of boring you , but he got on the tube in the opposite direction to the one he needed , just because he wanted to chat more .

Generate a question about the above context.
Why did they meet at a pub ?