public static MaplePacket showForeignEffect(int cid, int effect) {
        MaplePacketLittleEndianWriter mplew = new MaplePacketLittleEndianWriter();
        mplew.writeShort(SendPacketOpcode.SHOW_FOREIGN_EFFECT);
        mplew.writeInt(cid); // ?
        mplew.write(effect);
        return mplew.getPacket();
    }