I knew a WW2 Vet, dude finished as a Regimental Sargent Major. Blackie. Super nice guy, just a little brick of upbeatness.

I worked at a mall. One day, a group of teen boys were being all obnoxious and stuff just inside the mall.

Blackie walks in "YOU MEN STAND DOWN!". Everybody in earshot froze and stood up straight.

Teens quietly apologize and walk out.