A nut who knows a lot about bombs. We found this in a playground. Professional. Very cool...

Charles Weiss: [coming into Walter's office] A nut who knows a lot about bombs. We found this in a playground. Professional. Very cool stuff. You know... [thuds the bomb on Cobb's desk] Charles Weiss: Boom! Inspector Cobb: You think you should slam it around like that, Charlie? Charles Weiss: It's unmixed. You can't hurt it. This stuff is cutting edge. It's a binary liquid. Inspector Cobb: A what? Charles Weiss: Like epoxi. Two liquids. [puts a dab of the clear liquid on Cobb's desk] Charles Weiss: Now, either one by itself, [hits it with his shoe] Charles Weiss: you got nothing. But, mix them... [swirls a paper clip in both liquids and throws it at a chair, the mixture explodes violently knocking the chair across the room] Connie Kowalski: [yelling] Charlie, you're gonna be wearin' that chair up your ass! Inspector Cobb: [yelling] Christ almighty, Charlie! Charles Weiss: Like I said very cool stuff. Now, with a package like this, you get a warning. Now, the bomb has to arm itself. You'll see the red liquid pump into the clear before it detonates. John McClane: How long before? Charles Weiss: Ten seconds, two minutes, it could be anything. But, once it's mixed, be somewhere else.