
Today Grace «Amazing» Hopper, the Rear Admiral of the US Navy, and part-time developer of the world's first compiler and popularizer (and, to some extent, the author) of the term debugging, would have turned 107 years old.
The fact is that the first computer (and in fact, an improved adding machine)
Mark I was analog, and it included the mass of the relay. During the search for another malfunction, a moth was found in one of the relays (insect, bug). He was taped to the fault log, and Grace Hopper wrote a note: “first actual case of bug being found” (“first case of actual insect / bug detection”). Although the term “bug in a computer” was used previously, it gained popularity only after this incident.
So, when you debug your code, remember the first bug found:

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Grace looks at you and as if asks: “Did you find a mistake in your code?”.

Thanks to Wikipedia for the illustrations and Google for the search.