So, I just played through Dishonored for the second time. I got the Ghost, Shadow, and Clean Hands achievements (Go through the game without being detected or killing a single person in the same playthrough).
Anywho, I saved the game right before climbing the giant lighthouse, and then noticed my previous save from last year.
Game Save: The Light at the End: 18h 23m 10/13/2013
Previous save: The Light at the End: 18h 03m 10/13/2012
So, somehow, I managed to beat the same game, within a twenty minute difference, on the exact same day one year later. I wasn't even aware that was the last time I'd played it.