@Emma Bezzle, so far, it's just the initial shock to simulate the moment the knife punctures. Most people will never be stabbed in real life, but it's good for agents to know when they are. Some people don't ever know how it feels, and it's too late to call out when you're out in the field.
popularized by a Twitter account in 2010. It is named after the misunderstood giant in the 2003 film Big Fish. Older or alternative terms used locally include simply "the fog" or sometimes "Big Mama", Seasonal Names: It is often associated with the terms "June Gloom" or "Fogust" due to its prevalence in the summer months.