The exact origin of this clip is not documented, which is common for short viral warnings passed around as memes. Its humor comes from a universal experience, since almost everyone has heard a lifeguard shout about running near water. That shared memory helped it spread as a reaction sound for rule-breaking clips, vacation fails and staged skits. It stays useful because the line is instantly clear, the tone is funny rather than harsh, and it fits any moment where someone is about to get in trouble.