Investigators said the man walked into the Washington Street Shell Station just prior to 11 p.m. Monday, brandished the light bulb and smashed it on the desk, The San Diego Union-Tribune reported Tuesday.
Police said the man demanded money but walked away empty-handed when the clerk refused to turn over any money.
Officers said they were searching for the suspect, described as a Latino man, about 30 years old and about 5 feet, 10 inches tall.
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