BTW, it's duct tape, not duck tape. It's intended use is to seal the joints of sheet-metal piping, (ducts) used to conduct warm air from furnaces. In North America it's pretty heavy duty stuff. Very sticky and strong. The Canadian comic, Steve Smith, has made a cult following of "the handyman's secret weapon" on "The Red Green Show". What we call gaffer's tape in North America is a lighter-duty version of duct tape, usually siver-grey but sometimes black, a little cheaper and used to tape down mic cords, cables, etc. at a gig.