The sky is falling

Yesterday a huge limb from an oak in the back yard fell
on our house... and I saw it come down.
It wasn't dead. Nothing was wrong with it as far as I could tell.
Pretty strange. It smashed the cast iron plants I moved underneath it.
(and dad smashed the mums trying to move the limb).
Maybe its mad about the plants.
Or maybe its mad that my neighbors trimmed two branches off of it.
(I certainly am)