Around the time of the Nigerian civil war a Constellation arrived at Gatwick. Nothing unusual in that but it had two different registrations on the fuselage. It was using a third registration on the radio. I've always assumed it was an arms runner but I never managed to prove anything.
Then there is a 747 on top of a swimming pool which is used as the "launch point" for waterslide tubes. It's next to the Evergreen Museum in Oregon that houses the Spruce Goose.
Wings and waves