The first computer bug was a literal bug.

To be exact, a moth.

On Sept 9, 1947, a moth got trapped in Harvard University's Mark II computer -- causing multiple errors.

This bug disrupted the electronics inside the Mark II.

Here's a photo of that first computer bug.

@atomicpoet
It took me a little bit to realize that that's not a photo of the moth, it's the actual moth taped to the report.