Other - Has anyone else had NGK plug failure (ceramic coming loose from base)? | X-H2o
Cracked Ceramic Spark Plug in Cylinder - BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST
Why does a Piece of a Spark Plug work So Well at Breaking Car Glass? - HowMechanismWorks ?
Breaking a window with the porcelain of a spark plug, without the film the glass would just fall in. | Samsh & Grab - Window Tinting Special. When thrown with moderate speed