Anyone who's ever tied a string to a fly as a kid (or an adult) (I'm not admitting to anything :-) will truly appreciate this brilliant piece of non-traditional advertising...
"To promote their exhibition stand at the Franfurt Book Fair, Eichborn the publisher with the fly prepared 200 flies with an ultra light banner. The banner was attached with natural wax. After a short time the banner dropped off by itself. And the flies were not harmed."
Agency: Jung von Matt/Neckar