An architect, a mathematician and a musician are having a drink and a chat in a bar - each has their pet dog with them.
Eventually the conversation comes around to how a pet dog takes on the characteristics of its owner.
To prove the point the architect gestures to his dog, who immediately hops up, grabs a paper and pen and sketches out the design of the Golden Gate Bridge, down to the last nut and bolt.
Not to be outdone the mathematician gestures to his dog, who promptly jumps up, grabs a pen and paper and proceeds to write out Einstein's theory of relativity, finishing with e=mc2.
After a moment the musician gives the nod; his dog jumps up, drinks the three pints of beer on the table,shags the other two dogs and then falls asleep!