"Why are you looking so glum Woody" said the Great Tit, "Because I've just dropped my breakfast" answers Woody.   
You can see the dropped sunflower heart at the bottom centre of the picture.
This isn't as sharp as I'd have liked it to be, but it was taken just before 8am this morning through the kitchen window that hasn't been cleaned for a while!!    I've made a note to myself to clean them this weekend, weather permitting.