I was on a romantic holiday with an old girlfriend a few years ago. I was on the Arc de Triomphe at night around Christmas time, you could see the market on the Champs Elysees and the Eiffel Tower had a spotlight shining around from it hitting the clouds/buildings around it.
Whilst I was up there an American couple asked me to take a photo of them on their camera to which I duly obliged.
When I looked at the screen to see the result I was amazed to see that I had taken the single greatest photo that has ever taken, everything was perfect to the point where the Eiffel spotlight was shining directly upwards and all the lights on the roads and buildings looked perfect. As I handed it back and walked off I heard them saying how amazing the photo was and how much they loved it.
It still haunts me today that as a passionate photographer, the best photo I will ever take is of two random people on a camera I dont even own. Sake.