Unlike the egg conundrum, we can answer this one.
First, SmarterEveryDay made this video about chickens not moving their heads, all the way back in 2008:
Then ‘Rotate Your Owl’ by Weebl’s Stuff added disco music in 2011 :
Then this ad by Ogilvy & Mather Germany compared the non-moving chicken head to the steadiness of the Fujifilm XS-1 (January 2013, according to Ads of the World):
And finally the Mercedes Magic Body Control ad by Jung von Matt, which has been doing the rounds, appeared in September 2013:
Which one of these counts as the ‘original’ depends on who you ask. If it’s the one that first popularised the idea, it’s Smarter Every Day. If it’s whoever made it into a dance move, it’s Weebl’s Stuff. If it’s whoever made it into an ad, it’s Ogilvy and Mather. If it’s whoever made it into a viral ad, it’s Jung von Matt.
If it’s whoever came up with the idea in the first place, it’s the chickens.