When I bought the luggage box for the roof of the car a couple of weeks ago, there was a sale on duct tape (half price), so I bought a roll. Since then it’s been used to re-attach the handle to the boys’ magnifying glass, fix the neck of the broken toy guitar, and tape together one of the struts in the boys’ collapsible car-shaped tent. Very useful stuff – no wonder the Mythbusters could survive on a desert island with nothing but a pallet of duct tape.
Strictly speaking, I don’t think the tape I bought is duct tape, as it’s black rather than silver and is more vinyl than cloth. Still, it’s handy to have some around the house.