Can it happen to anyone?

Yes - you wouldn't know you had one of these heart problems but there are clues:

1. A faint which wasn't typical – most faints happen if you are over-hot, over-full, stressed, standing up, etc and you felt like you were going to faint. These cardiac "faints" are more out of the blue
2. Chest pain, breathlessness or dizziness during or after exercise not just being unfit, but keeping up with everyone else to begin with, then something odd happens