I can see it coming. "No, Sir", says our intrepid aviator, "There was PLENTY in there when I landed but I drained it all off to stop the Numpties from setting fire to it later on".
I shall file that one away for use at some future date. Nearly had a use for it last month. I landed at Keffalinia with only 8.5 tons of JET-A left in the tanks!