Splat!

Tuesday evening I was upstairs and heard a fairly loud crash that I could tell was inside the house. I was home alone, so came downstairs calling Eric's name, and turning on all lights as I quickly went through the entire house and basement. Doors locked, nothing at all looked out of place. So, I turned off all those lights, lowered the living room blind, noticed how the window seemed so dirty, but it was late, so I went on upstairs and that was that.
Next morning, I raised that blind to find someone had splattered the window with something slightly pink and sugary. Also, a piece of leaded glass that sits on the window sill had fallen forward making the sound I heard.
It was a cup of something from Starbuck's, thrown by some careless fool.