Like Grandfather, like mother, like daughter...

When I was a kid, I would often feel an overwhelming compulsion to eat candy, play games, sort toys or fold laundry in a very systematic way.  Once, my mother bought a bag of Reese's Peanut Butter cups and I noticed that my father systematically unwrapped each Peanut Butter Cup and then carefully lined them up in preparation for their impending doom.  Much like a henchman lines up his subject for the gallows. 

I have overcome much of my compulsive tendencies as it seems that time gets shorter but my to-do list gets longer and longer.  I can honestly say that I have never lined up my Reese's Peanut Butter Cups, Hershey's Kisses or M&M's prior to indulgence.

So, what but genetics would cause this? (see pic above) 

Chloe is systematically lining up her M&Ms before she eats them.  She won't eat even a single one until they have all been sorted and aligned perfectly.  Nature or Nurture?  Hmmmm...