The TSA paid $47.000 for such an app in order to randomize the line in which passengers should stand in in the airport pre-check. Watch on youtube the video named: TSA and the "Randomizer".
Do you have an airport and you want to randomize the pre-check lane the travelers must go? Now there is an app for that and it doesnt cost millions, it is for free! You can use it in other occasions too, clubs, squares or elsewhere for fun.