Our friendly office cat

This morning I found one of the stray cats living at the back of our office building relaxing along our hallway--which, by the way, is normally off limits to all stray cats there. I stopped to greet it before walking toward my office. To my surprise, it started following me and even sidled up to the door of my office when I inserted my key into the lock. When a colleague passing by saw this, he told me that this very same cat had entered his office earlier and refused to leave. I had to wait until the cat got tired waiting and started walking away before I opened the door and quickly slipped into my office.