void main()
{
object oPC = GetEnteringObject();
if (GetHasSkill(SKILL_SPOT,oPC)){
int skill = GetSkillRank(SKILL_SPOT, oPC);
int roll = d20(1);
if (roll <= skill){
object crack = GetObjectByTag("Knob");
AssignCommand(oPC, ActionStartConversation(crack));
}}

}