A couple of jokes to get the humour started:
If it's zero degrees outside today and it's supposed to be twice as cold tomorrow, how cold is it going to be?
Lewis bought two horses, and could never remember which was which. A neighbor suggested that he cut the tail of one horse and that worked great until the other horse got his tail caught in a bush. It tore just right and looked exactly like the other horse's tail and Lewis was stuck again.
The neighbor suggested he notch the ear of one horse. That worked fine until the other horse caught his ear on a barbed wire fence. Once again Lewis couldn't tell them apart.
The neighbor suggested he measure the horses for height. When he did, he was very pleased to find that the white horse was 2 inches taller than the black one.