...when you change the window sill, and get a special made deep one, so you can have flowerpots and other things there - and there will still be plenty of space for your cats to be comfortable there...
you get changed in a very small corner of your bedroom (the only spot hidden from windows) because your kitty wants every single set of blinds in the placed pulled up to look out of.
When you go to see your doctor about a crick in your neck, and he looks at you as soon as he opens the door and says "What cat was sleeping on your pillow this time?"