2.15. A man rides into town on Friday. He stays one night and leaves on Friday. (KK)
2.15 answer: Friday is a horse.
2.15 variant answer: The town is near the north pole. Night lasts six months. (FF)
2.15a. Variant with the same basic gimmick: A woman comes home, sees Spaghetti on the wall and kills her husband.
2.15a answer: Spaghetti was the name of her pet dog. Her husband had it stuffed and mounted after it made a mess on his rug. (Simon Travaglia original)