Acetone, from paint thinner or polish remover
Battery acid
Iodine crystals
Phosphorous, extracted from flares or matches
Ether or chloroform
Anhydrous ammonia from household cleaners
Sulfuric acid or hydrochloric acid from drain cleaners
Energy drink instead of OTC medications
Toluene from brake fluid
Freon from air-conditioners
Alcohol
Benzene or gasoline
Lithium from car batteries