My boss actually greeted me with a joke this morning that he knew I'd like, "Ever since I learned about confirmation bias I've been seeing it everywhere!"
This is a topic I am very interested in! I love learning about the human brain, and especially the ways in which our own minds deceive us. I know I am victim to the same fallacious reasoning, emotional judgement, and biases as everyone else, but I do strive to make myself aware of that and to learn as much as I can. So for me, substantial and sound evidence is all it takes. I don't tend to have a problem admitting when I'm wrong (so long as I can recognize it).