Ha ha. Me and this bloke I knew were at an unnamed airport once, watching a guy hose down the undercarriage of a DC3 with what looked like a bug sprayer.
We asked him what he was doing and through a fine atomised haze, he replied "I'm cleaning all the soot and oil off the undercarriage"
"Oh" I said "What're you using?"
He took the lit cigarette out of his mouth and nonchantely replied "Gasoline"
Without saying anything, the two of us took a couple of steps backwards. We were like a pair of synchronised figure skaters.
Maybe he was lying, but I never did understand how it didn't all blow up