Have you ever had a hairclip, a pair of keys, sunglasses or some other random item just disappear into nowhere from right in front of your eyes and remain missing for an indefinite amount of time only to resurface in the most unexpected place hours/days/weeks later.
A worm-hole traveler in your very home
No one knows where they go, or how they come back, no one comes and goes into your room except for you, yet these random items seem to appear and disappear out of their accord.-Sometimes from your very own handbag.
I am sure I didn't even need to ask this to anyone in my opening sentence, it happens with everyone, and there is only one logical explanation for it:
The parallel universe.
Yes. It really exists A self-contained separate reality coexisting with one's own, and sometimes these little odds and ends somehow vanish into the other world, so that we can be bothered by their absence until somehow they manage to return.
For somereason this does not effect people, I wonder why, I would rather like to see what Oz is like.