It's really scary how ninja like these little buggers are! Sometimes when it's TOO quiet, and I don't see one or both furbutts, I go looking for them to see what mischief they're up to. I tiptoe as quietly as possible to catch them in the act.
I don't see them in one room, so I turn around to move to the next room and AH!!!
There they are... right behind you.
It's one of those moments where they make me feel stupid.... lol