Imagine you are a particle. The You Particle is at present part of the skin on a humpback whale's dorsal fin (but any object in the Universe will do, pick something you like, that you would want to be a part of. Anything. Use your Imagination). If you decided you were getting bored of this humpback whale business and you decided to check some shit out.

You Particle blasts off, headed straight up like a tiny Superman, flying as fast as you can. you would pass and see a lot of things as you burn across our galaxy and into the darkness, seeing more galaxies, planetary bodies, brilliant clouds of gas that are as big as planets and stars for days.

You Particle keeps flying until it hits the end of the known Universe and you can fly so fast, you outpace its growth. Clean out of the Universe You Particle goes, but as soon as you hit the end, you end up right back where you started. On the humpback whale's dorsal fin. Huh? Quantum Mechanics at work. A particle, the You Particle can be in two places at once.