We know a family whose two kids work for the same defense contractor. They do projectile penetration tests on military vehicles, and then suggest design changes so the battery, starter motor, etc. will shield vulnerable areas. They fire all kinds or ordnance into very expensive pieces of hardware.
Recently, a guy was hassling the girl in a bar. Her brother sauntered over and said, "I wouldn't mess with her if I were you, she blew up a tank today."