Click Flash Boom

It might be my imagination, but I heard a "click" in my office at the same time there was a flash outside, in the distance.

Then a split-second later came a soft distant boom.

I think the click was my UPS getting past a tiny glitch on the line, the flash was a transformer exploding somewhere nearby (hence the simultaneous glitch on the line), and the boom was the delayed sound from said transformer explosion.

The glitch was so tiny the UPS did not beep, the lights did not flicker, and the APC Powerchute software did not show it ("Note: Power problems of a very short duration are not recorded here.")

Yeah, it might be my imagination, but I like my story better than "Someone's playing Enemy At The Gates!"