Actually, Arthur, NO, I haven't ever heard of a passenger who got liquid explosives aboard a plane and "attempted to ignite them," because it has never happened. The so-called Liquids Bombers were busted long before they ever had their explosives concocted, and long before they ever got near a plane.

Which is lucky for them, since, as far as I can tell from my reading on the net, there is no liquid explosive that is powerful enough to take down a plane that is not also so unstable that it would blow the bomber to bits on the taxi ride to the airport.