My aunt & uncle emigrated to NZ about 10 years ago. Each summer they return to blighty, for a couple of months, to visit family & friends. Not being in the first flush of youth, they always break their journeys for a few days. On one of these stop overs they were in Bangkok & visited an evening market, taking loads of photos.
When they reached the UK, they were visiting an old friend & were talking about their Bangkok holiday & their friend said that her sister had recently been in Bangkok too. Imagine the amazement when, looking at the photos, the friend saw her sister & brother-in-law immediately behind my aunt in one of the market pictures