Predictably enough, Tamara identifies the unsafe procedure which is causing this phenomenon (*ka-POP!*), and points out that it applies to just about any semi-auto handgun if the shooter is attempting to catch the round as it is ejected.
If the live round doesn’t fully eject because some goober has his hand over the ejection port to prevent his valuable 23¢ investment in a round of FMJ lest it get dirty by hitting the ground, and his hand slips or he runs the slide back and forth and back and forth, it is possible for the extractor or ejector or even a corner of the ejection port on some designs to bust the cap and fill his hand with shrapnel from the casing.Comments are also very educational. (And I do mean "educational" as in "Gee, I didn't know that!", not "Wow, they let you play on the internet?!)"
Don’t try and catch the round you’re ejecting. Don’t put your hand over the ejection port. Keep your hand away from it and let the round fall on the ground.