While I was stationed in Germany (1978), I took a trip to Italy.
Stopped to get some gas. This is when vehicles had a label "Unleaded Gasoline Only". Attendant didn't speak English, saw the label and filled up the van with Gasolio(sp?). For those not fluent in Italian, gasolio == diesel. Made it out onto the street when the van started to sound like Jed Clampett's truck.
Pumped out 30 gallons of contaminated fuel, refilled with gas, and took off. No damage done (at least none that I ever found out about).
Green handle? Not back then...