Saw it with my own two eyes at our local airport.
Piper doing touch and goes at dusk, comes in and forgets to put the gear down. Scrapes the boarding step and the prop twangs on the concrete. Fella powers up and goes round.
I grab my handheld radio and tell him we’re calling 911…and ask if he’s OK…he says…”Ooookay, I’m fine. Beautiful night out”. Guy comes around the patch, puts the gear down, lands, no problem. We call 911 back and tell them the plane is safely on the ground.
Guy taxies back, we think he’s B-line to the hangar. We go about our business. Next thing we hear, is the piper in the run up area…HE TAKES OFF AGAIN.
Back on the handheld, “Mister, are you OK?” Once again, he says “Uhhh, everything’s OK, why?”…”we think you need to land, you’ve landed gear up!”…”naw, can’t be!”
Guy comes around the patch, gear down and lands uneventfully. We wave him down at the fuel pump. Sure ‘nuff, the underside of the boarding step is smoothly polished and the prop is rose petaled.