Effect:

It's hard to believe so much magic could happen with virtually no moves - From red- and blue-backed packets two cards simply imagined by two spectators simply change places. 

Just like that. As an inexplicable climax, the spectator' thought-of cards prove to be the only cards prove to be the only cards that would make the trick work. 

Best of all, 'Twisted Sisters' accomplishes this spectacular effect in a squeaky clean fashion - no extra cards, virtually no sleight-of-hand, no suspicious or awkward handling. 

You will soon find out why, soon after its introduction, 

Twisted Sisters has been highly acclaimed as the best trick of its type.