Metspitzer wrote:

What? Did I miss something? Kill the two Main breakers in my panel,
and the only power left in the box is going TO those breakers.
Nothing, nada, on the power bars or anywhere else. I know for
sure; I always check for power presence either with a meter or the
ol' screwdriver test (but not inside the entrance box!).
Or was that just a bad attempt at sarcasm? g

What is the ol' screwdriver test?

It's a near relative of the "Smoke Test."