This has been making the rounds in my father's office (he works for the FAA's Regional Certification Center in Atlanta). When Santa Claus got ready to file his flight plan for this year, he was notified by the FAA that there was no record of his aircraft ever having been certified. He was further told that unless his craft was certified immediately, he would not be permitted to enter U.S. air space come Christmas Eve. After thinking about it for some time, Santa reluctantly agreed to the test. On the day of the certification test, the FAA inspector shows up with a gun strapped to his waist. Santa says, "Hey, what's the gun for?" The FAA inspector replies, "Well, we're going to do an 'engine-off' test during take-off."
(From the "Rest" of RHF)