void main()
{

object oPC = GetEnteringObject();

 if (!GetIsPC(oPC)) return;
 int DoOnce = GetLocalInt(oPC, GetTag(OBJECT_SELF));

if (DoOnce==TRUE) return;

SetLocalInt(oPC, GetTag(OBJECT_SELF), TRUE);

AssignCommand(oPC, ActionSpeakString("Hmmm, Something tells me that evil resides here...."));
}