BMW ran an ad in the London Times
warning that a Far East company specializing in "reproduction cars" was selling fake BMWs in the UK. The company offered tips for drivers to determine if their BMW was real or a forgery, such as checking the roundel to make sure it matched the genuine symbol. Also:
"Check the noise level. This can be done in much the same way as the engineers test every BMW. Sit in the car with the engine running. Ask another person to stand 10 feet from the passenger door and shout: 'Esel. Du bist 'reingefallen'. If this is inaudible, it's nongenuine."
The german phrase translates as, "You Ass! You fell for it!"