I can drink Red Bull just fine, though I'm not a fan of it with Vodka. The only time I ever really drank that sorta stuff (minus the alcohol) was at my old work place I was working in a room with no window and all I was doing was filing from 9am-5pm so I drank copious amounts of energy drinks to keep me awake, I was awake yet typing on the computer whilst twitching slightly really wasn't too fun.