Productivity, Thy Foe is Cat

I was just settling down to do some pre-work planning, but apparently this was not meant to be:

He laid down right on top of everything I was working on. Yeah, my office is a mess right now. Still need to mount the check rail over my monitor! In the meantime I'm using some extra-sticky Post-It pads on a portable whiteboard...that's a useful trick to write about, now that I think about it.

(Aside: Thine? Thy? Which one is it?) UPDATE: Fixed the title :-) I was confused whether Productivity was plural or not...thanks, commenters!