I learned to fly at a gliding club, where one of the two seat trainers was a Krosno KR0-3A Puchatek. Krosno eventually went under and sold the design and jigs to Barry Aviation in Florida, who renamed it the "Peregrine" and totally failed to build any, but that's another story
So anyway, about 1/3rd of the way between the fuselage and wingtip on each wing was a wing skin lap joint. It's covered in filler and painted over from the factory so you don't notice it on a new glider, but after it's spent a few years out in the sun absorbing UV the filler cracks a bit, and it looks like there's a chordwise "seam" wrapped around the wing.
We had a visitor to the airfield who was taking his first glider flight, and while we were preflighting it he asked about the seam. "What's that for?"
The guy standing next to me, without missing a beat and with a totally straight face, said, "It's for when we fly them off aircraft carriers. You've seen all those war movies where the planes are lined up on the deck with the wings folded up? They fold along that line."
"Ah," the guest nodded, brimming with newfound understanding.
The funniest thing was that the whole club got in on the joke, and by the end of the day everyone was telling straight-faced stories about how hard it is to find oceanic thermals, launching with shock cord attached to the steam catapult, flying while wearing wetsuits and scuba gear in case of an off-airport landing, and using submersibles to aid sea bottom retrievals. I think the visitor left at the end of a fun day of gliding genuinely believing that gliders flew on aircraft carriers.
The grand Aussie tradition of "taking the p**s."