Bit a mystery in this photo. Who does the arrowed hat belong to?

It's not mine, no-one else was there when I took the photo, and none of my social group wear hats. This picture is the only evidence that it ever existed.
Perhaps Neil photoshopped a hat into the photo in revenge for me disrespecting this year's serious MEW Christmas Competition by entering fake digital Candlesticks?
Or is my workshop haunted? Explains why my bits and pieces keep disappearing!
Any other suggestions?
Spooky…