An astounding spec ad for the Mercedes-Benz C-Class featuring the most incredible twist ending ever devised to promoting a car's on-board collision-prevention-assist system is ruffling some stuffy feathers at the headquarters of Mercedes parent company Daimler AG.

The ad, uploaded late last week by the four German film academy students behind it, starts with a disclaimer informing viewers that neither Mercedes nor Daimler authorized the making of this marketing campaign.

The disclaimer was added after Mercedes threatened legal action against the filmmakers, saying the commercial's content was "inappropriate."

Which is something you generally want to avoid saying about a video in which Hitler dies.