Before you jump the gun and say no stop and think for a second about the question. This isn’t a simple black and white question, what the employer wants to hear is some prior experience of dealing with difficult or challenging situations prior to applying for the job and this doesn’t necessarily mean security experience. You may have helped members of the public deal with rowdy passers-by, or helped calm your friend down on a night out, or even within your own family you may have an experience worth relating in the interview to prove your competency.