Oops.... Too snug?

Mis-adjusted my torque wrench.... :dunno: Long story short. Tightened the spark plug to 30 ft lbs instead of what I thought was 20. Was supposed to be 18-22.... I figured 20 was a good medium. :bag:

Upon figuring this out I tried to loosen the plug..... Snap! Oh thank goodness. Only the tip broke. Now I have to replace the plug. :soap:

Problems down the road? How much is too much to mess up the threads? :^:

Thanks!