That being said, even though you and all your friends and family members probably consume caffeine on the regular (and may exhibit many of these16 signs you're obsessed with coffee), we're betting that you don't know much more about the stuff, other than (a) it's in coffee and certain sodas, and (b) it's an energy-booster. There's actually a lot more you need to know about everyone's favorite legal drug—so here's a crash course.