Now, we at the Grumpy Neurological Emporium are pretty protective of our office supplies. It's been 4 years since drug reps were allowed to give us bountiful gifts of pens and post-it notes. But, in some cases, an exception should be made, and you, sir, are the lucky recipient of our benevolence.
Even in this digital age, every practice has paperwork. Usually it involves an info sheet with your contact information. You fill it out on a first visit, and maybe once a year after that. Mary hands you the clipboard and form when you come in.
Most people sit in the waiting room and fill them out while she copies their insurance card.
Why you decided to take it in the bathroom with you, I have no idea. But it was blank when you went in, and completely filled out when you exited 10 minutes later.
You can keep the pen, too.