When somebody casually
snaps a photo with no intention or motivation of
getting it to look perfect, but it turns out to be
absolutely perfect in every way. From the lighting to the angle, it's all perfect by pure chance.
Example:
Friend A: *goes around with their
DSLR and snaps hundreds of pics of the scenery*
Friend B: *not really interested in the scenery and only takes one pic from their smartphone*
Friend A: Hey check out the photos I took!
Friend B: Ooooo nice, they look so beautiful!
Friend A: What pictures did you take?
Friend B: Eh just one, wasn't really paying attention to the scenery tbh
Friend A: Oh, well wanna show them?
Friend B: Yeah sure
Friend A: ...WTH?!?? Dude your photo is SO much better looking than mines!
Friend B: Haha really? I mean, I literally just took one randomly, I didn't even
preview it afterwards.
Friend A: Damn, that
serendipitous snap tho!