For a while, when I came up with a really clever, original one-liner, I'd search Twitter history and find that it had already been made dozens of times.

Worse, we started a business and scoured around, looking to see if anyone had ever tried it. A little over a year in, we realize someone else had started it, two years before us, but with slightly different terminology. Fortunately, but we're both still around and kicking over a decade later, though with a good understanding now of why not many other folks had tried it.