Senility

The Gorse Fox guesses it just creeps up and bites you.

He left the house in the usual way and drove off towards Worthing. A mile from home a question flashed across his brain. "Did he lock the front door?"

The Gorse Fox was sure he had but had no clear recollection of so doing. This was not a doubt that could be ignored. He swung round the roundabout and looped back home. He had, of course, locked the door. He set off again.

Arriving at the Worthing Leisure Centre he grabbed his kit and played his football. It was only when he got back to the car that he realised that he might of locked the house, but he had forgotten to lock the car.

Doh!