Prius FartVertising.

(click ad, via) Sheep farts, eco-worse than Prius emissions. Right. Not the first car company to use animal farts in a Green ad. Ad agency: TBWA/Yehoshua, Tel Aviv. Previously in FartVertising (nobody covers FartVertising better than copyranter):
• Pig bubble.
• Butt tuba (nsfw).
• Farting bathtub man.
• Farting Marilyn Monroe.
• Farting Pelican sells spicy sardines.
• Farting tuna sells tuna & beans dish.
• Visualized farts sell Chinese air freshener.
• beano ad proof that women fart.