[cyclotic]

Marbles
Matchbox cars
chunks of steel
fishing sinkers
wheel weights
rocks
rice-A tribute to John Kerry
drywall screws
broken coffee cups
broken tile
broken glass
Imagine the regulatory possibilities

All newly regulated under the Explosives Control Act of 2017

[Darnright]

You left out pressure cookers. People don't need a pressurized cooker when a saucepan will do. Or unless they like the taste of food prepared with a "weapon of mass destruction".

(Or, unless they can vegetables or other edibles and want to avoid botulism. People don't need to can, when they can buy canned food!)

[TigersEye]

Trying to control potential projectile materials for bombs is neurotically absurd. A comprehensive list of suitable everyday objects would number in the tens of thousands at least.