The real major danger with Redbull cocktails, is that the caffeinated energy drink is able to counteract some of the drowsiness and other "drunken sensations" so it can often make you think you are less intoxicated than you are. There are 2 large dangers associated with not "feeling" drunk, when you are. The first is, you might be enticed into operating a vehicle or other machinery on the premise that you aren't drunk, even though your reflexes are just as slow as they would be if you were drinking straight vodka. The second is that you might continue drinking past your body's ability to tolerate the alcohol. The feeling of drunkenness is usually an effective inhibitor to alcohol poisoning (you will stop drinking when you feel dosey and lethargic) However, if you are unable to feel drunk you might continue to drive your blood alcohol higher, causing long term damage, or even passing out and and falling down. There has also been a suggested link between the consumption of Redbull and Vodka that suggests it can cause Cardiac Arrest, so like with any alcoholic beverage, enjoy it responsibly.