I am convinced that Luke has some (not so) secret vendetta against Charlie.
On Friday, when Erik and I were both home, we caught Luke running around in the backyard laughing. He had locked Charlie in the shed. The shed for which we have no key.
Fortunately, there is a little window. We opened it up and strangely enough, Charlie seemed very content to be standing barefoot in the dark shed. He was even pointing at dust balls floating in the air saying, "Bubbles, bubbles!"
True to form, when I took the camera out, Charlie even said, "Cheese!" It was really tempting to just leave him in there. I mean, he seemed so happy.