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It is probably the taste of Taurine (http://en.wikipedia.org/wiki/Taurine).

Taurine was originally extracted from bull's balls and hence when you drink a RedBull, you are giving a bull a ... lets say, doing a bull a favor :-)

(Taurine is not extracted from bull semen nowadays, of course ( probably coz this is not scalable :-p ) and it is claimed that the whole Tauine-Bull thing is a myth... but myths are fun to propagate)

http://www.google.com/search?q=taurine+semen

Hm. Didn't know it struck anyone else the same way. What my father does is fills one of those giant AMPM Big Gulps (or what the fuck ever they're calling them) with a mix of all the different energy drinks they have. Guess what that giant plastic mug always smells like to me? Bad bubble gum.

Try the Rockstar Juiced series. They're 50-70% fruit juice and don't taste like bubble gum. My only concern is that they contain sucralose, a substance I generally avoid.