Mirror, mirror, on the wall...

I read in a book on teaching middle school that narcissistic adolescents like to look in the mirror.  (No surprise)  Several of the students (usually girls) have frequently asked to use the bathroom over the past couple months.  One student told me, "You know, they just go so they can look in the mirror and fix their hair."  The book suggested putting a mirror in the classroom.  I was shopping over the weekend and bought a mirror.  I put it up today at the students' height...  Sure enough!  I caught one of the girls who often asked to go to the bathroom admiring herself in the mirror.  She smoothed her hair, smiled at herself, and bounced away.  Perhaps there will be benefits!