Can I ask why You are asking this first !!!!
Have you applied yourself or are you serving?
Thinking of Applying?
Doing some sort of Thesis into recruitment?
Or are you doing a Psychological course or something similar?
Your comment and Question's could seem very Loaded and Personal to a suspicious mind.
People deserve a more full statement of your Reason not Just "I'm genuinely interested to hear"
But I will give you My answer all of the above and none of the above My reason's at the time was not something I could explain even to Myself other then it Just seem the right thing for me.