What is the best example of “it’s a feature, not a bug”?

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No one set out to invent sticky notes. Instead, in 1968, Dr. Spencer Silver, a chemist at 3M Company, invented a unique, low-tack adhesive that would stick to things but also could be repositioned multiple times. He was trying to invent a super-strongadhesive, but he came up with a super-weak one instead. So what was a bug ended up being a new product !