Chris Rock is a moron--here's a life tip, comedians say things because they're funny, not because they're right. I do not take political advice from Chris Rock, George Carlin, Lewis Black, or Larry the Cable Guy.
Making black powder is not difficult. It's easier than making drugs. You can make it from charcoal, potassium nitrate (KNO3, you can get that from urine), and sulfur (an extremely common chemical). Home-made black powder might be risky in firearms but would certainly be lots of fun for blowing things up. You can make all kinds of explosives, as the movie says, from common household items.
Making black powder is not difficult. It's easier than making drugs. You can make it from charcoal, potassium nitrate (KNO3, you can get that from urine), and sulfur (an extremely common chemical). Home-made black powder might be risky in firearms but would certainly be lots of fun for blowing things up. You can make all kinds of explosives, as the movie says, from common household items.