"I had to google that pony advertising thing, it was just too confusing. And somewhat intriguing. So, what actually happened, is that the Green Party wants to stop pony riding at fairs, etc. During a speech, the leader of the Liberal Party criticized the Green for wanting to ban so many things, like cigarette advertising for example. Then he was supposed to mention the pony rides, but accidentally said pony advertising, which has caused a wave of jokes on Twitter and so on. That’s all. And apparently, before the guys showed up on the show, Stefan Raab had presented a few clips that showed what pony advertising could look like."
—Illy, found HERE (second to last comment)