To further clarify if the above question seems confusing, simply say something you did in the past that you would consider to be the worst thing you've done in life. The criteria for what you consider to be the worst is entirely up to you decide and can be as simple as something you feel/felt the most regret or guilt for doing, something you did that went the most against your current morals, or even simply something that you did that had the greatest legal consequences you've experienced in life. Your answer doesn't have to be extreme either as it as it only matters how you feel about it.

Also, feel free to mention how you have managed to come to terms with it, or even mention if you haven't come to terms with it. Maybe include any lessons you've since learned from that experience.

Given the nature of my question, I feel the need to encourage that discussions try to remain civil and people try their best to be understanding of each other.