I had some media that I really wanted but couldn't find anywhere (the Latin American Spanish dub of a movie). I could find unseeded torrents though.

I put the most promising one in my server and waited. Nothing for a month or so, then one day I check in and see it's at 5%. And it would sporadically continue for 3 more months until it completed.

As far as I could tell basically just some random person who happened to have this file was a both a casual torrenter and a leech. But unlike most leeches they didn't bother stopping the seeding of completed files, they just shut down the program altogether when they weren't downloading.

So they (with either throttled upload in their client or shitty upload speeds in general) would go on, open their torrent program, download something, and in doing so keep their program up long enough to seed a few MB before their download completed and they turned it off.

That file went on to be my highest seed ratio by far after lol