Accidents happen all the time.
Everyone makes mistakes, even if some are worse than others. Accidents happen.
Accidents, and particularly street and highway accidents, do not happen - they are caused.
Tragedies happen, accidents happen.
Enlightenments, like accidents, happen only to prepared minds.
If an accident happens in a plant, the aftermath will be unimaginable.
Actresses will happen in the best regulated families.
I mean, accidents happen. You learn from them and you try to make sure they don't happen again.