Bob210 always has a very in-depth part of the morning safety briefing where he goes over Squibs, Hang-fires, and Case-head separations.
Here's a video long time gun review channel Gunblast.com where they experienced a squib on-camera and the aftermath. Pay attention! These guys have a collective probably 100 years of shooting experience between them and perhaps familiarity lead to complacency. Fortunately these are exceptionally rare, and if shooting a 22LR not likely to be catastrophic.
https://www.youtube.com/watch?v=igD-YSMKbrg