One time, one time, Tweek accidentally called Stan "Craig" when his back was turned and had his hat off, and neither of them will let him forget it. Craig even teases that Tweek would mix them up during sex (something Tweek doesn't seem too opposed to). So at the next party the three of them are at, when Craig brings Tweek to a pitch black room and puts him face down on the bed, who really is behind him?