It reminds me of similar situations (I cant come up with any off the top of my head specifically) of riddles given where children get the answer instantly, but adults overanalyze it and dont get the answer.
Wow that was funny. DragonMistress I think I know what your talking about. It was some pattern with numbers and you needed one side to match the other in answer or exactly or something. But adults or 4th graders which is when i saw this problem overlooked everything while my teacher had said that kindergarteners would just flip a 6 (or 9) to become a 9 (or 6 can't remember) and so it would work
the ink might float up or, while in outer space, the air inside the thin plastic walls would explode, trying to fill all space. same reason you wear a space suit, other than to breathe.