Duck Tape vs. Duct Tape

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I remember back in my early days of writing, which I started doing when I was 8 years old for whatever reason, that at some point I found a magazine called Writer's Digest and finally convinced my parents to get me a subscription and used to read it cover to cover. Looking back, there wasn't a whole lot that was useful between the covers. Writing is a talent. It's not something you necessarily learn how to do. You can either write, or you can't. But I do remember several articles and even advertisements by major brands that made it a point to understand the difference between what something is, and what is a brand. Companies spend a lot of marketing dollars to keep up their image, and so they want to make a strong distinction between them and anyone else selling similar products. For example, there are tissues, and then there are Kleenex. The two are not the same thing. Kleenex is a tissue, of course. But any tissue is not a Kleenex. Another example is ChapStick. It's a lip balm, but not all lip balms are ChapStick. Windex is a blue liquid used to clean glass, but any glass cleaner that happens to be blue and cleans glass is not Windex. The same applies to something like duct tape. There is that silver stuff we are all universally familiar with that is very sticky and quite useful, and then there's Duck Tape which is a brand of duct tape. Can you think of other things that we commonly mistakenly use the brand name for even when the thing we're using isn't the brand?