Our old cat seemed to know the whereabouts of every cat flap in the village. He was variously accused of licking a Sunday joint and terrifying a pair of rather nervous cats into incontinence in their own home. He certainly had a major fight with next door's cat in his own kitchen, which ended with both cats shooting out of the cat flap, demolishing it as they went.
However he was a great character and nobody stayed cross with him for long.
We first met him early one morning when he came into our bedroom through a rooflight. When his owners moved away he came back to us, through deep snow, and we were delighted when nobody came to claim him.
Cheers,
Gillie