Do you have some examples?

Probably because sour would make your lips pucker? I think lemons would be more obvious.

What’s his work like? Reading some of the descriptions on his site it sounds like it has some horror elements.

Which is?

https://www.businessinsider.com/selfie-after-plane-crash-2014-1

How would someone get started doing this?

This would make a good community, post news stories and have other people try to predict conspiracy theories about them!