Mixing Red Bull with alcohol is a really bad idea. But that's what some people are doing. They think they can get a buzz with the alcohol, but keep their energy up from the red bull.
However, a study published in the April issue of Alcoholism suggests people who've been mixing alcohol with Red Bull energy drinks only think they are more in control. But compared to people who drank straight alcohol, the study showed those who mixed it with Red Bull tested significantly worse in coordination and reaction times.