It's a series about two kids, Dipper and Mabel Pines, who are sent by their parents to go stay with their great uncle (aka Grunkle Stan) at his place in Gravity Falls, Oregon. It's a bit like the X-Files and the Goosebumps books had a baby together and the baby was an awesome children's tv series that wasn't as creepy as at least the X-Files could be sometimes.
You should watch it.
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"Well, you've gotta stop selling your soul to the devil. He's just gonna want more and more, it's like a drug."