every body has someone to be nice to for shabbat, they must give them presents i.e sweets, cards, serving drinks to them. But they must keep it a secret, the best way to do this is to do nice thing through other people e.g kim is natasha's gamud(friend) but she asks Dan to give her some sweets. then the person gets confused of who it is, at havdulah you must tell your gamud who you are it is funny when they had no clue.