We'd flown into Japan, and were actually on a tram into the city when I realised that everything was still on the plane. Wallet, passport, money, luggage, everything except the clothes we were wearing.

And we'd passed the first junction in the tram lines, so I wasn't sure that just catching a tram back in the opposite direction would even take us back to the airport.

At this point, I realised we were in a real mess.

And then, logic came to my rescue. If the passport was still back on the plane, then there was no way I could have cleared immigration. And if I couldn't have cleared immigration, then ipso facto, I couldn't be where I was. Therefore, this was a dream, and I could wake up, please?

So I did.