Man's Prank on Sister Snarls Traffic for Hours Brother pretends there are explosives in sister's car By Matt Cantor, Newser User Posted Nov 29, 2013 10:26 AM CST 20 comments Comments A man's prank on his sister shut down Interstate 15 in California. (Shutterstock) (Newser) – A man's prank call to his sister resulted in the closure of an interstate highway in California yesterday. During the afternoon, the man called up his sister anonymously to warn her that there was a bomb in her car, 10News reports. She pulled over on I-15 and called 911, prompting an investigation that closed the highway in both directions for about two hours in San Diego. The brother called back after an hour, revealing the prank. He was arrested on a felony false threat charge. "There (were) thousands and thousands of people that were stuck in traffic for over an hour based on this hoax," says a police officer.