Once or twice I've gone and found another source for the download, copied it into my torrents folder, forced my torrent client to re-scan the file and started seeding it.
Watching a thousand other clients tick over from 99% to 'seeding' is weirdly gratifying.
I recently had a torrent finish after a year and a half. It wasn't something I was really concerned about but it gave me a nice feeling to know it had finished.
IDK. It was hung up at 70 something % and I never got around to deleting it. Then one day after having long forgotten about it the notification saying it was done popped up and I was like "holy shit!"