This thread reminded me a lot of people don't realize how addictive caffeine is. It really is a case of the more you drink it the more you need it. Withdrawals can be physical and include headaches, nausea, insomnia and a lot of other crappy things like depression. My Uncle actually was an insomniac and they blamed it on the caffeine.
Well anyways enough about that. This is probably one of the most awesome thread derailments in a while. Started off about MMA endorsements and now it is a coffee vs tea vs energy drink battle royal!
I get horrible headaches if I don't get my caffeine fix. A jolly good reason to continue drinking it I would say.