I swear to G-d, this is a real Captain Planet screen shot (
here's proof. Just skip to 2:15)! Velma and Shaggy really did make a background appearance in a Captain Planet episode about inner city gang violence. I'll give you a minute to let that sink in....
..........OK, here goes!

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Velma: OK, Shaggy. We've influtrated the Planeteers' HQ. Now we just need to find proof that they blew up the Mystery Machine and burned down my school's science lab!
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Shaggy: Are you, like, sure they're guilty?
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Velma: Those dirty hippies have been sending my lab threatening letters all week! And they kept bugging Fred to replace our van with a Prius right before it blew up!
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Shaggy: Uh, the term "dirty hippie" is kinda mean, don't you thi-
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Velma: And Fred told me that they also kidnapped Scooby Doo and released him into the Amazon jungle.
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Shaggy: THEY WHAT!?!!??
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Velma: They said they were "
releasing him from human enslavement". Fred and Daphne are trying to track him down now. Didn't you wonder why they weren't with us?
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Shaggy: DAMN DIRTY HIPPIES!!! &%&$#@!!!!