Too many cops think that training only occurs in the classroom, on the range, or on the mat, and that just isn't so. Anything that changes your long-term behavior is training, good or bad. If it changes the way you do business, then it's training. It just happens that storytelling is one of the most powerful forms of educating and training; we are literally hard-wired to learn from someone telling us a story.
I like to tell my stories since I know exactly what I did wrong and if I let someone else tell them they might make me look even more foolish than I really was. I also enjoy laughing at myself and find it good therapy for those times I think I'm either too smart, too cool, or too anything else and need to come down a peg or two.
Just a pointer, though, about telling "war stories" about yourself; share your mistakes and what you learned, otherwise you are just telling a story about you and not teaching.
My younger son loves to tell us about whatever he did recently and he does it in very dramatic and entertaining fashion. Once when he was asked by a family member why he always talks about himself when he tells his many stories, he looked absolutely flabbergasted as he emphatically pronounced, "But you guys, I'm always in the story."
My son is right about one thing: Of all the stories we tell, the best ones are the ones we actually lived. So when you tell the history of a critical incident or an exciting call to others, you can help them see how they can stay safer and learn from your mistakes but only if you are willing to admit your mistakes.