First of all, I am not crazy. I've had my phone since 3/21 so I only have a handful of photos on it and a movie, all showing in the gallery. Today I got home from work, opened up the gallery, and there was an image on there that was not placed in there by me 
It looks like part of a company logo or something, not even a complete image of whatever it is.
Does anyone know what apps could have done that? I just have Facebook, which only syncs when I open it, 3 email accounts (stock GMail app plus two accounts in the stock mail app), and dropbox which I use regularly.
The image shows up in Astro File Manager under downloads, and the image info says it arrived today at a time when I was driving in my car
Any ideas??

It looks like part of a company logo or something, not even a complete image of whatever it is.
Does anyone know what apps could have done that? I just have Facebook, which only syncs when I open it, 3 email accounts (stock GMail app plus two accounts in the stock mail app), and dropbox which I use regularly.
The image shows up in Astro File Manager under downloads, and the image info says it arrived today at a time when I was driving in my car

Any ideas??