The ad, Do the Test, was produced by the agency for Transport for London to highlight how easy it is for drivers to miss the presence of cyclists on the road.
But earlier today, the clip was removed from YouTube "due to a copyright claim from a third party".
The ad asks the viewer to count the number of passes made by a basketball team during a passage of play.
It then reveals that while the viewer was concentrating on counting the passes, they missed the presence of a person in a bear suit, moonwalking through the crowd.
However, a video which is virtually identical was copyrighted by US professor Daniel J Simons in 1999.
Simons, who works at the University of Illinois Visual Cognition Lab, produced the video to demonstrate a spatial awareness theory.
A user who saw contacted us and said: "The ad is absolutely identical except they have turned a gorilla into a bear."
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