If you came home and found someone sleeping in your bed, what would you do? You'd probably call the cops, right? Attempt to kick the person out? Maybe pull a weapon? Run and hide? Any of these would be acceptable responses. But this guy did something a little different.
When he walked into a bedroom and found a drunk stranger completely passed out in his bed, he simply woke the guy up and tried to get to the bottom of things. The drunk guy was a little belligerent, so this was no easy task, but he started getting some answers. It turns out that the guy used to live there and, in his drunken state, forgot his new home and wandered back to his old place and passed out.
Instead of kicking the guy out, he simply asked him to get out of his bed and offered him another place to crash. It doesn't seem like he took him up on his offer, but still...what a nice guy!