A woman was driving in her car on a narrow road. She was knitting at the same time, so she was driving very slowly. 
A man came up from behind and he wanted to pass her. He opened the window and yelled, "Pull over! Pull over!"
The lady yelled back, "No, it's a sweater!"

Website 4 the Day:
Learn how to, but not while driving:
http://www.knittinghelp.com/