The black bottle of Arsenal cologne by the design house of Gilles Cantuel looked realistic enough for police to halt rush-hour traffic Thursday morning.
The result was a three-mile (five-kilometer) traffic jam in South America's biggest city - already known for its congested streets.
It wasn't clear if the bottle was left as a practical joke or for more sinister reasons, police investigator Renato Fernandes told the Globo news Web site.
Police have made no arrests in the case.
