Me and my brothers goes to a con, buy something from a creepy guy and get sent to a land of magical talking ponies as Bill Cipher, Asriel Dreemurr and Noximilien. (Gravity Fall, Wakfu, Undertale, MLP, and others Crossover)
Man goes to convention dressed as multiple characters at once. Man purchases a Twilight Sparkle mask. Man regrets his decision as he ends up in a Pokemon-filled Equestria as another Twilight Sparkle. And then, something unexpected... Dawns.