Looking at this question, I recognise both of the two large images in the top two answers - I'm sure I've seen both on a Stack Exchange question somewhere (I suspect not SU), but for the life of me cannot find it.
The user who posted the question also posted both answers, and is clearly making a lot of rep out of the question. I'm slightly worried that if this is a copy question, the user is cheating the system with plagiarised content.
I've not placed this a comment on the question due to my lack of evidence, and the potential for me to have just imagined it, but the more I look at the two images the more I convince myself they're not new to SE.
So thought I'd raise it for the wider audience to see if anyone else recognises them or if I am simply going mad.