Well I would totally own whomever you throw me at so you fail. lol
And everyone here did not think very well with their answers. Because you don't govern how useless it is until you use it in certain ways. So here are things I can counter:
Feather Useless it may seem but if jabbed up the nose perfectly the result would cause instant death. Also you can jab the pointy end into the carotid artery in the neck for a bleed out.
Cheese What if you are fighting someone of lactose intolerance? Then that would cause the airway to be swelled shut and the victim would most certainly die by suffocation.
1000 Dollar Bill Such thing doesn't exist but if it did, you could make precision laceration in certain areas for a uncontrolled bleeding to the victim. This is hard to achieve but is possible.
Brass Knuckels Are you serious? These are deadly weapons. If used with a professional these could kill someone in under a minute.
Unicorn Unicorns could gore and own you any day. So yeah enough said.
Plastic cup Lodge this in someone's throat and your set for suffocation.
A Gun Clip An ammo clip is the correct term, but this could be used as a blunt weapon or if set on fire could make a nice explosive.
A Potato Lodge in a throat or make someone allergic to a potato and make them consume it.
Well see it all depend on HOW YOU USE THE WEAPON not it's looks or it's uselessness in everyday life. So think twice next time.
