Ideas of questionable quality

[Eibel]

I want boxes of thumbtacks, and thumbtacks individually, that you can put in shoes, on chairs, in bags to poke people.  You can dip them like a scalpel, they don't go through shoes, but you can sew a box of them into someone's body with the lid open to cause constant damage.
You can throw an opened box of thumbtacks and it will spray out all the tacks in the box in a cone in the direction you threw them.

Janitor should get a vacuum to be able to handle bunches of tacks though