Acetone is the organic compound with the formula OC(CH3)2. It is a colorless, mobile, flammable liquid and the simplest example of the ketones. Often used for its flammability by pyromaniacs and/or pyrotechnics. (But just because you use it doesn't mean you are one.)
Bystander: Are you buying acetone?
Pyrotechnic: I'm... using it as... paint remover?
Bystander: What are you doing with that acetone?
Exasperated bystander: Some idiot bought it as paint remover and almost burned the house down, I'm getting rid of it.