Many years ago, in my time as a Customs Officer at Melbourne Airport (yes downunder in Australia, not Florida) a JAT (Yugoslavian Airlines) pilot was inspecting his plane with the ground engineer before take-off. Normally, this means just making sure that the wings and engines were in the right places in the right numbers. This day, however, the ground engineer noticed that there was a fuel leak from a wing tank. He brought this to the notice of the pilot who noncahalantly dismissed the problem with the comment "No worries. We get to 30,000 feet, she freeze up, no problem."
I am sure glad I never flew JAT.
[Told to me by the ground engineer.]