COCAINE

Heard about this a couple days ago and decided to take a look myself. Study was done on mice, so whether the mixture has the same effect on humans, is not proven (I'd guess it's the same). Basically when the mice consumed a mixture of alcohol and plenty of caffeine(energy drinks), their brain took on the same effects as cocaine.

Sauce: http://firstwefeast.com/drink/2016/10/mixing-energy-drinks-with-alcohol-same-as-cocaine