I remember having read a story about a fixed-gear Cessna happily taking off from some airfield, and later been told by the en-route FIS that they'd received a call from his departure airfield, that they found some bits of his gear on the runway.
From the cockpit, no visual verification was possible, so he declared an emergency, went to a controlled field, did the flypast and four guys in the tower, with binoculairs all confirmed they saw all the gear as it was supposed to be. Very cautious landing with the rescue services standing by. A greaser.
Turned out the bits were from another Cessna, who had a mighty interesting arrival.