Dr. Pepper. I drink it pretty regularly anyways, but I usually keep it isolated to one or two meals and "special" activities (watching movies, show marathons, etc). However, if I'm getting really stressed, then I am constantly putting one or more down.
This fall semester, I was the stat-guy for my college's volleyball team, and they insisted that I give up soda for the season. I could deal with that, and things in general were going smoothly. However, there was one night where I was trying to put the stats for a big tourney, and my stat program kept crashing. A job that would normally take me 1 or 2 hours took me 8 hours, and I was seriously stressing and freaking out because I couldn't just grab a Dr. Pepper to "take the edge off" through all of this.