Your favourite photo?

So, just been away for a few days in our campervan. Took a few photos and have taken one of my fave pics of all time.

It got me thinking. I've taken better technical photos, compositionally better photos and photos with better cameras and resulting sharpness/resolution etc.

So why is this iPhone, low res photo my fave......

I rarely get the wife to agree to having her pic taken. We are both so genuinely happy at the moment the pic was taken. We stopped off in the new campervan (on its first outing). So I guess it's the rarity of the Mrs in a pic and the memories/emotions it evokes.

So my question to you good people is:

What is your favourite photo that you've taken and why?