Sometimes, you dunno what the fella (the medium) called is in deed the person that you wanna seek. I've heard that some of the medium use baby ghost (guai chai or toyol) to cheat families to believe that the spirit that enters the medium is indeed their deceased family member.

Coz these guai chai that enters the medium really "knows" almost any queries you ask. Things like this mostly done by a clan of medium called "Mau San" - very popular among old folks in Ipoh. They can perform "Gong Tau" (spell) and ask for nombor ekor (4D).