How interesting that Boing Boing has a post about Red Bull and Alcohol. Interesting becasue I recently tried this cocktail. The study notes:

Study results show that drinking alcohol and Red Bull® together significantly reduces the perception of headache, weakness, dry mouth and impairment of motor coordination.

I would describe it as being drunk with inertia dampeners. The drunk effects is still there but spinning effect is reduced. I can certainly see how someone could over drink using this combination. It seems pretty dangerous actually, enough so that I will not be drinking it on a regular basis.