For those familiar with the source material, this sounds a lot like Black Adam’s history in ancient Egypt.
Specifically, the scene where the wizard Shazam (Djimon Hounsou) introduces himself to young Billy Batson (Asher Angel) includes a sparkly light show that physically plays out the history of the powers being bequeathed.
The wizard says that the first attempt at choosing a hero was done long ago and recklessly, and millions were killed as a result.
Black Adam’s presence – or, more accurately, lack thereof – was a topic instigated independent of what we got to see in the screened Shazam! footage, but it is worth noting that one of the scenes did seem to bring up the villain’s past existence in the DC Extended Universe.