They don't have to be big monumental conflicts or fuckups or whatever. And yeah, you should totally have a pre-canned answer. It can be something minor; "I once

They don't have to be big monumental conflicts or fuckups or whatever. And yeah, you should totally have a pre-canned answer. It can be something minor; "I once spent a lot of time implementing feature X, and then I realized I could have just done feature Y in a quarter of the time." Or, "Bob wanted to build X, and I thought Y would be better, so we disagreed about it, and ultimately Z." (And make sure the story doesn't end in, "and I was super wrong.") I know it's phony, but job interviews are sales pitches. Preparation helps.