The bubonic plague wiped out 1/3 of Europe's population but the depopulated continent meant that peasants had more bargaining power and this hastened the end of the feudal system. So in spite of nearly destroying civilisation and killing millions in crippling pain the black death had some beneficial effects.
I cannot say this about the cocktail of Guinness and red bull.
This is now pretty much the national drink of Jamaica. The barman did not bat an eyelid, or try drive a stake through my pitch black heart, when I ordered it. There are even songs about it
I am not going to even describe what this tastes like. I think if I had gone up and grave robbed an Indian burial ground I would have caused less desecration.