This is the warning sign on a gas pump.
It's very rare.
But the unusual tragedy happened last week in Pennsylvania, just about 40 miles from here.
A spark from static electricity at a gasoline pump ignited a fire that killed a 19-year-old Cumberland County man who was an aspiring police officer and avid bowler.
Experts say L. David Byers' death highlights some very important safety tips for pumping gas:
• Be aware that static electricity can build up on your body and be discharged in spark when you touch a metal gas nozzle.
• Do not get back in your car while filling it with gas, as this can cause a buildup of the electricity.
• Make sure you touch metal on your car or somewhere away from the gas nozzle to "ground yourself" before you reach for the nozzle during or after fueling.
• If a fire occurs, don't panic and pull out the nozzle. Run away and get help.
"You can save a life," said Robert Renkes, executive vice president of the Petroleum Equipment Institute in Tulsa, Okla., who has researched static electricity fires at pumps.
Renkes said that based on information he has collected at the institute, Byers' death appears to be just the second in five years across the country.
Turkey Hill Minit Markets has 230 stores with pumps here and has never heard a report of a static electricity fire, spokeswoman Erin Dimitriou Smith said.
"Customers should remember that millions of people fill their car up safely across the state each week," she said.
Warnings on gas pumps remind motorists not to smoke or partake in other risky behavior while fueling, she said.
But authorities say the danger of such fires is real.
Watch the video of an actual refueling fire incident at the Petroleum Equipment Institute's Web site
It is not known exactly how static electricity ignited the fire that killed Byers.
Lower Allen Township Fire Chief Frank Williamson said video taken at the BP gas station where Byers died early Friday morning does not show a clear picture of what happened.
Authorities do know that Byers was not smoking and his car was turned off, as he had his keys in his pocket, Williamson said. His driver's-side door was closed.
But it was very dry at the time — a prime condition for static electricity, the chief noted.
State police fire marshal Eric Keebaugh, who investigated the fire, said several things could have happened to discharge the electricity and spark gasoline vapors.
After he got out of his car, Byers might have closed the door with his elbow or his shoe, which would have insulated his body and not allowed him to "ground" any electricity, Keebaugh said.
Some clothing also is more prone to lead to the buildup of static electricity, he said. Renkes said he knows of one fire that resulted after a man put on a windbreaker.
"There was a perfect alignment of the conditions to create this tragedy," Williamson said.
Keebaugh, who works out of the Carlisle barracks, has never investigated a fire like this one, but he said they do happen. An acquaintance of his sparked a similar fire while pumping gas at a station in Newville, Cumberland County, within the past year.
It sparked a small fire that damaged the man's pickup truck but did not injure him.
"The fact is, it can happen," Keebaugh said, adding, "It's just like being struck by lightning. The chances are slim to none, but it happens."
In 2008, the Petroleum Equipment Institute collected data on such fires to see what the contributing causes were. The information came from drivers and from reports to the National Highway Traffic Safety Administration.
One of the causes of pump fires is not cell phones, though signs on many pumps warn motorists not to use a phone. There is no documentation that using a cell phone while pumping gas can cause a fire, Renkes said, though perhaps a motorist talking on one could become distracted and forget about the real risk factors.
One of the major factors is motorists who get back inside their cars while fueling, building up static electricity, according to the report.
The report found that 78 percent of the motorists involved in such fires were women. "The young and the skinny" also are more susceptible to the fires, Renkes said.
Women are more likely to get back in their cars for several reasons, including to put their credit cards back into their purses, to check on children in the car or even to stay warm, Renkes said.
The young and the skinny are more susceptible because they can sidle in and out of their vehicles without touching anything.
Millersville University physics professor John Dooley said the most dangerous time for static electricity fires is after you start fueling. There are many opportunities to ground yourself when you get out of the car, touch the pump and touch the fuel gauge door.
Dooley said some states have pumps with discharge plates, a piece of shiny metal with a sign reading, "Touch here before you pump gas," to remind motorists to discharge electricity.
"That seems like a sensible thing," he said. "Just having the reminder there is a good thing."