Weird picture shows up in gallery. Didn't take it.

I was deleting pictures from my gallery and I noticed the last picture shown in the gallery was not taken by me. I was at home and didn't take a picture at the time the picture showed it was taken in Details. The picture looks like a logo of sorts but it says "Atom Holocau" and part of word is cut off. Creeped out. How could this happen?

from Android Forums at AndroidCentral.com - Ask a Question //forums.androidcentral.com/showthread.php?t=766095&goto=newpost
via IFTTT