My little little sister showed me Gravity Falls on Disney Channel. First Reaction, holy crap a good cartoon! Second reaction, holy crap a good show on DISNEY CHANNEL!
The intro alone is fantastic, the music is catchy and there's so much mystery that I don't know if it's real or just cartoony filler to fit the theme of the show. Either way check it out. [link]
This guy above is the Illuminati Man...that's what I call him anyway. He shows up for a split second at the end of the intro, but here's a better picture of him. [link]
I saw other fanart/speculation of this symbol, particularly one where the guy was dressed in red and I really liked it so that's what I decided on for color. [link]
Anyway enjoy and check out the show if you can, it's great ^^