13 x 7 = 28 !!
This is a very funny video by Abbott and Costello. Abbott and Costello used to have a show of their own first on radio then on CBS (if I remember right). These shows have many more of such sketches. How many ever times I watch it, I cannot stop having my ribs tickled. They remind me of our own Padmanabham and Ramana Reddy. Another version of the same: