Oof.
Once, my friend and I switched backpacks while we were walking home...
It did not end well for her...
On the other hand, I got to carry a super light backpack for once!
My friend has a locket with a shard of glass inside... she showed me the cut on her hand from it. My backpack itself is my weapon. It's like 15 pounds, so if I slam it on someone, they will probably fall over. Hehe.