Bars serving Carlsberg receive a dongle of sorts that turns their TV into a digital sign which counts down to a specific Happy Time at which the beer is sold at 1/2 price. Patrons of the bar can use a special hashtag to to extend the countdown and enjoy the cheaper beer. This sounds like major smoke and mirrors. The dongle would have to have internet, power, HDMI unique hashtags generated per bar and HDMI. It was probably a stunts that took place at one bar and was filmed. Neat idea.