An icicle would be the perfect murder weapon. You would never need to hide it, it would never show your fingerprints, and if you were really thirsty by the end of your crime spree, you would have a built in water bottle. Seems practical to me.
I can never, ever seem to take my own. I always seem to be able to give people good advice, but I can never follow it. Even when my brain knows that it’s a good idea. I like to go against what I inherently know to be good.