Here's the photo with his girlfriend that Andy tweeted. The caption said, "i love my girlfriend even if shes [sic] a gemini." Seems a bit odd to throw shade at her astrological sign, but that's what he did.
Twitter user @Loveebug1010 posted this GIF of Phoebe from Friends, again lending credence to the demon theory. However, Phoebe might not be the most reliable source. Fortunately, even more users decided to weigh in.
Another user jumped passed her being a demon, and instead accused her of being Satan. Usually, Satan is known for hanging out in Hell and making deals to collect souls. But maybe he's also dabbling in freaking people out on social media.
Other Twitter users weren't trying to figure out the reasoning behind the picture. They just knew it made them confused and angry. And in the photo seen here, if you check the reflection, you'll see exactly how angry.
When you're this confused, sometimes you just have to throw a flag on the play. This photo was called for a penalty of "Freaking out too many people, causing them to no longer understand what is real and what is fiction."
In any case, many users openly confessed that they would be stealing this photo, without any shame. Which makes sense. If you ever have the opportunity to confuse and freak out people on the internet, you take it.
For his part, Andy has not yet revealed the truth behind this photo. So we can't say for certain whether it's Photoshop, a twin, or some other logical explanation. Or maybe it actually is the result of dark magic. We may never completely know for sure.