Cold Feet, anyone?

Or, rather, a cold foot anyone?
Since two days a single black sock is hanging over the balustrade in the 4th floor here at work.

I mean.. It´s cold. I wear boots. How can anyone loose a sock under these circumstances, huh?

Or how can anyone loose a sock at work at all?
Why would someone pick up somebody elses used sock and hang it there?
Bummer.