Well, I drank a can of Red Bull this morning. I didn't especially like it but it wasn't horrible, either. I drank it after my usual three cups of strong coffee (I drink three to six cups of coffee every morning - three being the minimum). I did notice that I felt quite lively. However, it may be due to the fact that today was a holiday and I slept later than normal. Anyway, my curiosity is satisfied. I think it would be useful, as some have pointed out, to take along in the car to avoid drowsiness when driving and no coffee is available. It might also come in handy to keep in reserve for caffeine addicts like me who get a splitting headache if some unforseen even prevents them from getting their usual dose of morning coffee.