Graduates of Northeast High School beware. More than 50 live chickens were let loose in the high school, forcing the school to close, the Philadelphia Inquirer is reporting. Not even joking.Security cameras show a handful of “culprits” gained access to the school around 9:30 p.m. last night, along its Cottman Avenue entrance. They also spread chicken feed across the school’s floor.It appears to be an elaborate prank. A prank that at least one secretary told the Inquirer would be preferred than a school shooting or similar news that more often gives headlines to high schools. A farmer was summoned to round-up the birds and haul them away to Fox Chase Farm, the district’s agricultural school. Hefty fines are expected.