These scientists are really happy. But just seeing their reaction without knowing the reason behind it would make you think they are crazy. They aren’t crazy, if you know the reason behind their happiest occasion, you’d too behaved the same way in that situation.
Very recently, Blue Origin started a project, by which they are aiming the rocket launch with people into the space and bringing back to the ground by reverse launching or landing the rocket. This rocket landing test was a big success. Watch the happiest reaction of these 400 rocket scientists, who worked behind this mission.