The feel of it, close to the body when one is trembling (with fear, or anticipation, or both). The unyielding give when it bounces from a nearby explosion, and throws one into the air, like a grain of rice on a drumhead, with bruises from one's buttons. Unforgettable.
That, if you are playing along at home, is telling detail.
And Ursala's on about quesadillas and Spanish guitar players.