Since this turned into a flashing brake lights discussion I'll weigh in:
Almost every new GMC flashes the third (center) brake light 3 or so times when applying the brakes. Very annoying when in stop & go traffic.
To me it appears the M3 in those videos is hard braking and the lights are actually flashing.
I understand the illusion of flashing lights based on the flicker rate vs. the frames per second of the recording device. As someone said it's similar to rotating wheels that appear to stop or even rotate in the wrong direction due to difference in rotation vs. frames per second. One of the few physics lessons I still remember from twenty or so years ago is about stroboscopy. Google it, it's very cool
