In March 2016, a video appeared that purportedly showed Secret Service agents driving a limousine in reverse at high speeds on a racetrack:
The video was frequently shared along with the claim that it showed Secret Service agents training for "advanced reverse escapes." A video posted to the Vomitorium Facebook page racked up more than 28 million views within two days of its initial posting.
This video, however, does not show anyone from the Secret Service training on a racetrack. The footage actually comes from a racing video game called Forza Motorsport 6.
The original video was uploaded on 8 March 2016 to a YouTube channel that also features several other videos from the Forza series. This particular video originally included an intro that clearly identified it as video game footage:
Secret Service agents (and others) are given tactical driving courses as part of their training, much of which does take place on a track or an obstacle course and includes route surveying, motorcade driving, and evasion techniques. However, it's unlikely that the training would be done in the Presidential limousine, and if it was that there would be a sizable audience (as there is in the above video) watching the course without much of a protective barrier.