I know a guy that is a very nice person, very giving. I was out riding with him in a group the other day, and he was always the one way out to the left ignoring his surroundings talking to people. Some people can't talk and ride at the same time, it's easy to get engrossed in what you are talking about and not notice what's up. On a MUP, seems like this would be even easier since your guard is down.