Shoot Three Light Poles at Exit 115
This easter egg is only helpful while doing the main quest and can only be done after obtaining the DG2 turret for Ol’ Tessie.
Head to the Exit 115 diner POI and you should see three light poles that are not functioning. One of these light poles will be sparking with electricity at the top. Shoot the light with the DG2 turret on Tessie and the sparking will move to one of the other two. Shoot that one and the sparking will move to the last pole and after shooting this last one, lighting will begin to strike the roofs of the buildings at the location.