A man decided to visit his grandfather, who lived on a farm. As he neared the farmhouse he thought he saw his grandfather sitting on the front porch, naked from the waist down.
Sure enough, he pulled up to the farmhouse and got out of his car, and his grandfather WAS naked from the waist down. The man asked, "Grandpa, do you realize you are sitting on the front porch, naked from the waist down?"
"Yep." replied the old man.
Stuttering the man asked, "Why?"
The old man looked at him and said, "Well, yesterday I was out here and it was so danged hot, that I took off my shirt. As a result I got a stiff neck. This here was your grandma's idea."