Back in 1974, the lab brought in large cockroaches to see what would happen when exposed to large amounts of radiation. The lab dumped the surviving bugs into garbage bags sprayed with pesticide at a local dump. The huge, hissing cockroaches got loose and invaded Natick homes. It took six months for the town to finally get rid of the infestation.
Pictured: A hissing cockroach from Madagascar is held by Mark Berman from Bugman Entoprises.