My attempt to wean myself off caffeine lasted all of 20 hours when I suffered a severe headache and caved in when the temptation became too great. Mom's like, hey, let's go buy some sodas. I'm like, no, no, I'm trying to get myself unaddicted. Hours later, still suffering, I am in Mom's car at the 7-11 waiting for her to return with two 12-packs, one Pepsi and the other Diet Pepsi. Ah, why did I cave? And why do I know I will face the same headache tomorrow?