Something you have done, but still can´t believe you actually had the courage to do.
Mine is obvious. If you had told me I´d be living in Spain, and be speaking Spanish, I would have run for the hills and would have just kept on running... I was the one who´d hyperventilate before Spanish class and curse the Romans. (I had to curse somebody...) But like with all important decisions in my life (moving to a new country, marriage, kids...) I did without thinking.... But then, it can take me a week to decide on a new pair of shoes... Am I the only one?