Had an idiot driver overfill an above ground tank at a cropduster's barn. Not only did he not verify the tank would hold what he had loaded (which was 1000 gallons more than he was supposed to load, ) he parked parallel with the tank so the truck was right next to the overflow. Thankful both planes were airborne, because 8500 gallons of 110LL did a fine job of melting everything aluminum.What's even crazier, is pumping 10LL AvGas that has a flashpoint basically that is ambient temperature. Look at that stuff wrong and it flashes.