Breaking Bad2008

Walter H. White:
[while shopping at the building supply center, Walt notices a cart full of meth supplies. The Tweeker who belongs to the cart puts boxes of wooden matches in the cart] You're buying the wrong matches. Those matches. They're the wrong kind. Red phosphorous is found in the striker strips, not the matches themselves. You need to get the big 200-count box of individual match books. More striker strips. You understand? Those only have the one. And don't buy everything in one place. Do it piecemeal. Different items, different stores. Attracts less attention. Hmm? You following me here?

[the Tweeker is so spooked that he abandons the cart and runs away]