Flag Pole

Student:  "Mrs. A, you are limping.  How did you hurt your knee?"
Me:  "Well, we had that active shooter drill in the school yesterday.  We were in the gym and the fake gunman walked in shooting.  I took off and one of the students was fake shot in the leg.  So, I was dragging him to safety and I tripped over a flag pole and twisted my knee.  It does not feel good."
Student:  "What was the drill like?"
Me:  "It was crazy.  We knew it was fake, but when you hear that gunshot, you just take off.  But, we learned a lot.  I know now that if that ever happened for real and we saw or heard a gunman, I would make sure to look around for..."
(student interrupts me)
Student:  "Flag poles?"