Which cognitive bias catches you most often? (Founder's confession inside)

Hi everyone, Volodymyr here, founder of Cognitive Biases Academy.

While building the library, I had to read primary research on 190+ biases, and the uncomfortable part was recognizing myself in most of them. My personal weak spot is the planning fallacy. This project was supposed to take 6 months. It took much longer, and I knew about the bias the whole time. Knowing the name doesn't make you immune; it just helps you catch it a bit earlier.

So here's the thread: which bias catches YOU most often, in work or in life? Confirmation bias when researching a purchase? Sunk cost on a project you should have killed? Anchoring in a salary negotiation?

If you're not sure what to blame, browse the full list at cognitivebiases.academy and find your usual suspect. Everything is free and available in 66 languages.

I'll reply to every comment with the research behind your bias and one practical way to catch it earlier.