On the outset it sounds absurd, but individual particles may at any given moment be here, there, or on the moon. This has been experimentally proven to be the case, over and over again. Anyhoo, all the individual particles that make up your hand, say, may be here, there, or on the moon.
It is, of course, highly unlikely that any one, let alone all of them, would be anywhere other than expected, which is why you cannot normally push your hand through a solid object without resistance. But given infinite time, it is inevitable such a thing should occur.
It is my hope that one time, just one time, when I walk into a door, I will walk through it.