A Dia de los Muertos moment. (Or maybe my house is just haunted.)

It's Dia de los Muertos (Day of the Dead) and I'm celebrating this Mexican tradition of honoring those who have gone before by posting a couple of photos.  Several times during the past few weeks a strange apparition has been found on my front door.  Is it just me or does that look suspiciously like a skull? 

Maybe it's my ancestors giving me a sign that they've blessed my house.  Or, as my friend Felix suggests, maybe my house is haunted.  And according to Felix, if it is haunted, it has something to do with the front door.  How does he know?  Because when you leave a set of keys in the front door's dead bolt lock, they swing suspiciously for 10, 15, even 20 minutes with no additional physical encouragement. 

Then again, it could just be a cool play of light. I'll let you be the judge.  Whatever it is, I still appreciate all my ancestors have done for me.  Happy Dia de los Muertos.