Abstinence is the only 100% sure method of avoiding STDs and unwanted pregnancy.
Not eating is the only 100% sure method of avoiding food poisoning.
Never leaving a windowless room is the only 100% sure method of avoiding sunburn.
Not walking is the only 100% sure method of avoiding stubbed toes.
Not driving, riding in cars, or coming too close to any public or private roadway is the only 100% sure method of not being injured or killed in an auto accident.
Never crossing over or under a bridge is the only 100% sure method of avoiding dying in a sudden freak bridge collapse.
Never picking up a fork is the only 100% sure method of not accidentally stabbing yourself with the tines.
Never coming into contact with anything wooden is the only 100% sure method of not getting a splinter.
Never handling anything paper is the only 100% sure way of preventing paper cuts.
Never using plastic bags is the only 100% sure way of avoiding wrapping the plastic bag around your head and suffocating.