Red Bull gives you wings, apparently.
Given the weight to wingspan ratio of most birds, and taking into account that humans don`t have hollow bones or beaks to reduce weight, these wings would need to be around 18 feet wide to be of any use for powered flight. Now, to actually flap a pair of wings that wide would need enourmous chest muscles. Not bodybuilder huge. Not even World`s strongest Man huge. Around a third of the human`s previous total body weight should do it. Of course, that means they would instantly rip through the skin of the unfortunate person`s chest. Since they would be anchored to the person`s ribcage and breastbone, which, unlike a bird`s, is not massivly strengthened, the muscles would also rip the person`s ribcage open like one of those folding toolboxes, leaving the heart, lungs and other vital organs unprotected. And even if somehow it didn`t, the wings would still be useless for flight, as the human breastbone lacks a keel and because of the heavy head instead of a lightweight beak the unfortunate human would instantly crash headfirst into the ground, pulverizing their entire head.
So to finish, it might be best if the cans bore large warning labels saying: Red Bull rips the skin off your chest, tears your ribcage open leaving your vital organs exposed and pulverises your head and skull!
And you complain about the taste...