How Many Of You Used To Think..

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It isn't?!?!?!??

Duct tape is the correct spelling if you must know

but then to confuse things more...there's a duct tape brand called "duck tape"

Wait wait wait wait THATS NOT HOW YOU SPELL DUCK TAPE WELL ILL BE DAMED

it isn't

Actually, it's either. Both because water slides off it like off a duck's feathers, and because it is used to repair ducts.