void CatchOpportunity(object oPC, location eLoc, float fReaction)
{
    SetLocalInt(oPC, "FishChance", TRUE);
    //effect eEffect = EffectVisualEffect(93); //splash effect
    //ApplyEffectAtLocation(DURATION_TYPE_TEMPORARY, eEffect, eLoc, 0.5);
    PlaySound("as_na_splash2");
    FloatingTextStringOnCreature("!", oPC, FALSE);
    DelayCommand(fReaction, DeleteLocalInt(oPC, "FishChance"));
}

void main()
{
    object oPC = GetPCSpeaker();
    object oFishingSpot = GetLocalObject(oPC, "oFishingSpot");
    location eLoc = GetLocation(oFishingSpot);

    //effect eEffect = EffectVisualEffect(93); //splash effect
    //ApplyEffectAtLocation(DURATION_TYPE_TEMPORARY, eEffect, eLoc, 0.5);
    PlaySound("as_na_splash1");

    //Let's remove one instance of fishing bait from the PC's inventory
    object oBait = GetItemPossessedBy(oPC, "fish_bait");
    if (GetIsObjectValid(oBait)) DestroyObject(oBait);

    //Now we need to fire the opportunity event at a random time
    int nDelay = Random(18)+3;
    float fDelay = IntToFloat(nDelay);
    float fReaction = 1.0; //The PC will have this many seconds to catch the fish
    if (Random(100)+1 <= 75) DelayCommand(fDelay, CatchOpportunity(oPC, eLoc, fReaction));
}