Here's one for ya.
Imagine you're in a box, the box is in space. Now in the box, in space, you are on a bassboat. In the box, in space, on the boat you are fishing. Now you can do this because, in the box, in space, on the boat, fishing for bass, you are on a lake with both peacock bass and smallmouths. Now you have that mind picture imagine a huge lever with a pulley flips the entire box upside down. Are you in the box, in space, fishing off the boat, for both peacock bass and smallmouths flipped upside down also, or since there is zero gravity in the box in space, only the box moves?