"Accident, mistake, or misfortune" means something outside a person's control, or something which a reasonably prudent person would not be expected to guard against or provide for.
N.H. Admin. Code § Rev 401.01
#2080, eff 7-5-82; ss by #2272, eff 1-11-83; ss by #2821, eff 8-17-84; ss by #4511, eff 10-26-88; ss by #5911, eff 10-14-94; ss by #7410, eff 11-23-00; (See Revision Note at chapter heading for Rev 400) #9309, eff 10-30-08