I’m not sure what one might call this, its created before it could be considered a reappropriation. The Yes Men, Rainforest Action Network, and Amazon Watch install bunk Chevron advertisements.
Well executed.

http://chevronthinkswerestupid.org/chevronthinkswerestupid.org/
From the Chevron Thinks We’re Stupid site:

When Chevron rolled out its fancy new “We Agree” ad campaign, we were ready for them. We had only the tiniest fraction of Chevron’s budget — the company typically spends as much as $90 million on an ad campaign like this — but we had the element of surprise, and we were determined to press our advantage.
Before Chevron’s press release announcing the campaign could hit reporters’ inboxes, we sent out a press release of our own… on the company’s behalf. The company’s own press release was guaranteed to be full of greenwash. We wanted ours to be a bit more truthful. It featured quotes from real employees, but in this case they were describing a campaign we might actually be inclined to agree with:
“Chevron is making a clean break from the past by taking direct responsibility for our own actions,” said Rhonda Zygocki, Chevron vice president of Policy, Government and Public Affairs.

“Oil Companies Should Clean Up Their Messes,” reads one ad; the small print refers candidly to the damage done by oil companies around the world. “For decades, oil companies like ours have worked in disadvantaged areas, influencing policy in order to do there what we can’t do at home. It’s time this changed.”
Another ad, “Oil Companies Should Fix The Problems They Create,” is just as topical. “Extracting oil from the Earth is a risky process, and mistakes do happen. It’s easy to pass the blame or ignore the mistakes we’ve made. Instead, we need to face them head on, accept our financial and environmental responsibilities, and fund new technologies to avoid these mistakes in the future.”
Folks are even encouraged to get in on the “act” and create their own spoof, here.