If I see a form, I instantly decide whether it's worth filling in based on how much I want to pass it. And I often press the back button when I'm feeling lazy.

If I see a form, I instantly decide whether it's worth filling in based on how much I want to pass it. And I often press the back button when I'm feeling lazy. …captchas really don't help. Don't fix a problem until it exists, and even then try and find an alternative method to fix it if it may negatively affect your users.