Cognitive Dissonance

I thought it would be fitting for me to write about this because I experienced this feeling earlier today. I was on a short break at work and was sitting in the break room. I noticed that I was thirsty and I saw the Pepsi machine across the room and thought to my self that it would be really awesome to have an iced tea right now. So expecting that I would feel instantly refreshed by an ice cold beverage I walked over and bought a can of iced tea for sixty cents. After one sip, my thirst had been quenched and I didn't really have any desire to finish the can. I felt like I could have gone without that can of tea and just saved myself the sixty cents and the change from the dollar I had to break. It's pretty sad that I thought about this purchase of an iced tea this much, but I guess if I had to feel cognitive dissonance about something, regretting a sixty-cent purchase is better than something more expensive.

Have you felt cognitive dissonance about anything lately? Why did you regret the decision?