I had a moment of sheer panic yesterday, when the first version of a PCB seemed to Just Work™. The first time I did anything with integrated battery charging, first time I used a solder paste stencil and hot plate reflowing. All the components just snapped into place, no shorts, uC came up and could be flashed, I/O worked as expected... Surely this had to be a sign of the imminent apocalypse, right?

Fortunately I made a mistake dimensioning the charging bypass diode, so crisis averted 😮‍💨