Really nice work Barb . Love them all , and the fishing ones crack me up 
The problem is that the resistor below the plugs gets too hot, causing expansion, and when the plugs get removed, they break at the "burn bead" as my co-worker calls it. He also said it has to do with having aluminum heads, I want to say. With the plugs, there's only one plug that doesn't have that "burn" on it, and it's by Bosch I want to say. The place I took the truck assures me that next tuneup, the breakage won't happen. We shall see.Bummer on that triton plug issue. i understand there are some 1 piece plugs that should be used for the replacement to avoid fractures in the future.