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It's all those chemicals in your body. They're DANGEROUS man! They mess you UP!
— Heroine Bob • SLC Punk!

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker insists, with emphatic urgency, that the chemicals inside a person's body are dangerous and can wreck them. The capitalised words and pleading 'man' give it an insistent, warning tone, presenting this as a claim the speaker feels strongly about.
Context reviewed