Someone hacked every tornado siren in Dallas. It was loud.

Last year, someone kept hacking into traffic signs in Dallas — corrupting bland electronic messages intojokey missives such as: “Work is Canceled — Go Back Home” and “Donald Trump Is A Shapeshifting Lizard!!”

On Friday night, 18 minutes before midnight, every single one of Dallas’s 156 emergency weather sirens started blasting. The sirens, whose purpose is to be heard by anyone caught outdoors in a tornado or dangerous storm, screamed from the southern reaches of Oak Cliff to newspaper columnist Robert Wilonsky’s house in the north. They blared for an hour and a half, to the annoyance, terror or amusement of 1.3 million residents.