Probably Not What Batman Would Carry: Batarang Knives
These are some officially licensed Batman TWIN BLADE folding knives. My God, Wayne Enterprises has gone downhill. They cost about $9 and come in different colors so you can accessorize any outfit. "But why do they have two blades?" To hurt yourself, silly!
Thanks to carey, who told me if she's gonna accidentally stab herself it's gonna be the old fashioned way: running with scissors.