you were a friend of Simon Petrikov, you went to visit him at his house and you sneaked into his house, You see how the back of Simon's head was glowing, you approached him and touched Simon's head and you were sent to another place

you leave a ice cream cart and you look around you seeing a world without magic and you see how a blonde woman approaches you

Fionna: eh!? W-Who are you! Where is my cat cake!?