Dual use rock
Something I need to remember. I usually check my rocks, but not always.
"What, pray tell, is a dual-use item?" I asked. I'm afraid I chucked just a little, causing her to glare, withhold a satisfactory answer and call her supervisor. He hefted my rock, scrutinized it for a moment, and agreed that my specimen was indeed a dual-use item, meaning a potential low-tech weapon.
from No Stone Unturned