The electron flow could resulted in a spark that might ignite explosion if it surrounded by flammable gas (such as methane or gasoline)
This phenomenon was first popularized by a physicist named Micheal faraday who call this as "the beautiful flash of light attending the discharge of common electricity"
An associate should continue to smile and try to be of some help in this type of situation.
Explanation: The customer might be frustrated because of the question they're about to ask the employee. Maybe if the employee helps with the question there frustration will end. :)
