All sorts of things can happen on the road: for example, you might run out of fuel a hundred meters before a gas station, and the only container you have with you is a five-liter bottle of drinking water. When you arrive at the gas station, you might see a sign that says, “We do not sell fuel in plastic containers.” A natural question arises: why?
In fact, the main reason for this restriction is that plastic tends to accumulate static electricity. Think of a charged comb that “sparks.” The same kind of spark can occur when flammable liquid rubs against the walls of a plastic container, causing it to ignite.