Question

While pumping gas when I was in town I noticed a sign on the fire extinguisher. It said, "This fire extinguisher to be used only by trained people." OK, my question is that if there is a fire and no one else around are we just supposed to stand there like Sims, with our hands on our faces screaming, and let the place burn down! Or are we supposed to try and help. I know the sign is there for liability reasons but there are plenty of people who would not try to do anything because of the sign.