When you see it.
It's the Internet's version of Where's Waldo? Somewhere in these photos, hiding in plain sight, something is lurking, weird, Photoshopped or just hilarious.
[seealso slug="weird-gifs-you-cant-unsee"]
Don't worry -- we promise these are safe for work, and nothing scary will pop out onto your screen.
Now, take a long, hard stare.