Ninja rocks are broken shards of spark plugs. Since they can quickly and almost silently fracture the glass windows on most cars, ninja rocks are increasingly the tool of choice in "smash-and-grab" auto burglaries. They have no traditional association with the ninja or ninjutsu, only being named such due to their "silent but deadly" function in burglaries.
Read more about Ninja Rocks: How They Work
Famous quotes containing the word rocks:
“A part, a large part, of travelling is an engagement of the ego v. the world.... The world is hydra headed, as old as the rocks and as changing as the sea, enmeshed inextricably in its ways. The ego wants to arrive at places safely and on time.”
—Sybille Bedford (b. 1911)