I love capturing the details. Things often overlooked or forgotten. It's fun capturing shots no one pays attention too and even more fun to put yourself in the mindset to look for them. It takes a conscious effort to get our minds in the right state to look for shots that are out of the ordinary. I try to practice getting into this mindset even when I don't have a camera; looking for interesting backgrounds, light, shadows, compositions and subjects.
Sometimes this gets me in trouble with the girlfriend as I'll interrupt a conversation with, "That would make a great photo!", hopefully she'll get used to it... As with anything it takes practice to get better, which is why I look for the details everyday.