I'm having some time off coffee. The last few days (coffee-free)I've been experiencing the odd headaches and hungover feelings. I didn't connect the two. Then this morning I'm in a meeting and a work buddy offers to get me a drink. I asked him to get me a hot chocolate. Anyway the machine was broken so he brought me a coffee, hey no big deal, I didn't want to appear ungrateful, I thanked him and drank the coffee.
One sip! After one sip of shoddy machine coffee, my headache disappeared; my vision became clearer; my perception notably changed.
I didn't realise coffee did all that to me, I thought I just liked the taste! That's some potent stuff. I'll be back on the expresso soon enough but that was an intersting learning experience - whoah!