Earlier quoted context omitted.
Surely you mean the spontaneity after you have actually bought the DVD.
That, or rewatching a pre-watched film for comfort. Not every movie needs to be new. I rewatched Firefly on the whim the other week and now Malcom In The Middle because I own them on DVD. Not available anywhere else digitally, at least with my subscription's.
if you watched it before you already downloaded it...