Criminal Minds2005

Derek Morgan:
[showing Garcia the bomb fragments] How these things are put together can tell you how the unsub thinks.

Penelope Garcia:
You sound like Gideon.

Derek Morgan:
Okay, ouch. Oh, you think it's bull? Okay... all right.

[showing Garcia an evidence baggie]

Derek Morgan:
You see that section of pipe? Okay, that right there used to be part of the cap. It screwed onto these threads right here. But see, here's the thing: it had to be done very carefully because even if one tiny grain of powder got onto those threads while he was working, that little bit of friction would have ignited the bomb. Boom, boom, boom. See you later, unsub. Now, he didn't have to use a powder that fine. He didn't have to use threaded caps, and he didn't even have to use a steel pipe, and it would have been a whole lot safer if he hadn't. But the bomb wouldn't have been nearly as deadly. So what does that tell you about our unsub?

Penelope Garcia:
He's one sick puppy?

Derek Morgan:
[laughs] To say the least. One sick puppy that aims to kill. Not scare, not vandalize, or make some kind of political statement. Kill.