Caffeine doesn't do a goddamn thing to me - first time I ever had espresso I fell asleep in my chair ten minutes later. And it isn't because I drink caffeine often, all I have is a cup of either black or herbal tea five or six nights a week (been known to go herbal for a week at a time) and I don't even like coffee.

Someone I know is a hardcore addict. Like, her need for caffeine has a significant negative impact on her day-to-day life, finances, and physical and mental health, that kind of addict.

And then there's you, who has one single cup of black tea and goes full tweaker.

Caffeine is bizarre stuff.