Remember, Mythbusters also did an entire episode on this and determined it is not possible. However, it is possible to happen with static electricity.

So imagine you're in the late 80s and the economy is still in the dumps from Black Tuesday. You had to sell your BMW and now you're driving a Toyota. It's winter. You've got the heater cranked in your car. It snowed a lot, and you got snow in your car because you had to move and you don't have covered parking / garage anymore so snow got inside. The snow melted. It's getting humid in your car. But it's cold as hell out. Luckily one of the few things you didn't have to sell to survive the downturn was your wool coat. You love your wool coat.

Damn it's cold out as you're pumping gas. You go in your car to stay warm. You get out of your car dragging your wool coat across the cloth seats. Static electricity builds. You're on your phone, oblivious, trying to get the bank to give you a break. The static electricity has built up. You reach for the handle of the gas pump which is NOT coated in rubber (not for a few more years!) and **ZAP** there's the 20k volts required to make a spark


That's about the only plausible explanation.