I'm fickle regarding superficial matters; my mind can change ten times a minute if it's something that isn't particular important. But once I've made my decision, I'm usually very certain I've made the right choice.

I also like to flip a coin, assigning one decision to one side. And then when the coin is in the air, I tend to find that my mind finally comes forward with which side (and therefore decision) it would prefer to see, rendering the result pointless.