Times Square



"How did we do it technically? Well, as you can see on the comments, 95% believed (and still believe) that it was all done in post production. However, all we really did was rent the screens and had our footage loop there for hours. The clips had visual sync points which allowed us to sync the iPhone version of the video. Once the sync was done, then it was a piece of cake from there. The actor was familiar with the timing of the "hacks". We did hundreds of takes on each screen."

Momentum: Hacker with iPhone take over NY Times Square screens - A Viral Marketing Campaign for "Limitless"
 
LOL at the commenter that said he saw with his own eyes that it was a fake when the red balloon was up by the screen but the screen was showing normal footage for hours...