The emergency broadcast signal playing in the background?
of course
Yeah it’s pretty much the defining effect - I think it even started while the screen was still black
Someone behind me in the theater said, "what a stupid end". Guess they didn't hear it or knew what it meant. I was also surprised it was in 3D as well. Usually post-credit scenes are non-3D.
I was surprised part of that scene was in the trailer (the bit with the ant playing drums).