Lateral Thinking

Me and my friend Ashoke went to Arcus, our college food joint. Ashoke ordered for 2 plain paranthas. While the order was being executed, we sat down to have some conversation. 

A cat passed by in her own gracefully inconspicuous style, avoiding any attention.

Ashoke: "Why doesn't the cat learn from Dog that we are not to be afraid of? "

Me: "Humm, the Lion is not afraid of us, it has learnt that without learning from Dog"

Ashoke: "Ok... let us create a Lateral Thinking Puzzle"

Me: "Ok.."

A few minutes of intense deliberation

Me:"A man orders for 2 plain paranthas, sees a cat pass by and asks to make a lateral thinking puzzle?"Why?

Ashoke:"A man is driving a bike, suddenly he leaves both his hands, turns around and sits the other way round and wobbles his posterior to make his bike go in circles." Why?