Hey guys, OP here! :) So, good news everyone! I'm not dead (yet). Though I almost died laughing at these comments, thanks for making my day! :D I do believe that there is a logical explanation for this odd occurrence. We do have a communal laundry room in my apartment, as many of you have suggested. The strange thing is, we live in a building that only has 8 apartments, and none of us have babies or young children. And I was not doing laundry that day at all, nor do I recall seeing the sock before we left, which was in a very noticeable spot on the floor. I saw it immediately upon our return. Soooooooo ghosts. It's definitely ghosts. *DUN DUN DUUUUUUN* The plot thickens.