Taking me seriously is a big mistake. I certainly wouldn't.

This marketization of personal information is a big mistake.

I made a big mistake of my life.

That would be, in my opinion, a very big mistake.

I finally figured out what my crime was. I lived. Big mistake.

The press keep asking me, 'What was your biggest mistake?' But if I had made a big mistake, they'd all be writing about it, wouldn't they?