Chests/Shulkers with tnt

The way it would work is that if TNT exploded a type of block that has TNT in it, the container that contains TNT would explode too, with explosion power scaling with the amount of TNT in the container. This option should be able to be disabled in the game settings without disabling achievements, because it is not much of a change. 

Edit: There should also be a limit on how much it scales, so it can't crash games or anything like that.