The Dangers of Returning a Late Book

So yesterday, I was attempting to return my book from last month's book club to the Provo City Library. Yes. It is now 2 weeks late. Why? I am not really sure, because I finished it just 3 days after the due date which would have fallen into the Provo Library's lovely grace period.

Anyway, on to the action. It was a super snowy day and so I was having a fun time just trying to get around and for any of you who have tried to pull into the Provo City Library's book-return drive-through, you know that it is a pretty tight corner even when you aren't dealing with inclement weather.
Anyway, so I pull in, but I was a little far from the slot so I ended up dropping the book down on to the wet and snowy ground below the car. Without even thinking, I open my door and just start jumping out to save the soon-to-be avalanched-in book. (PS I think I might be a little dash happy tonight)
However, in my haste to save the helpless book I forgot that I had not put my car into park when I stopped so at the same moment I put one foot on the ground and start moving my other foot (which had been on the brake) out, the car starts rolling forward! Perfect!
I quickly move my foot back into place on the brake even though my other foot is still on the ground and the car screeches to a stop.
I catch my breath, jump back in the car, put it into park. Jump back out. This time the car doesn't move. I grabbed the book and returned it. It was a little wet, and I hope I don't get fined, but mostly I am just grateful that a) my car didn't end up a permanent fixture in the side of the library and b) that my body didn't get sucked in between the open car door, the book vaults and the underside of my car!