Sonic, Knuckles, Shadow, Amy, Tails, Silver and Eggman was playing Ouija board beceause of a stupid bet. Sonic grab the triangle and sign all of his friends to put their hands on his, just next to the triangle. The triangle move after that Sonic said:

Sonic: "oh spirit, are you there with us?"

Silver: "please no..."

Tails: "I agree with Silver-"

and the triangle goes for a yes. It was terrifying...