although shumi get into rivalrys with everyone he meets, this really has me scared. as you saw on sunday JP tried to pass MS on the outside on lap 1 at imola. I found this on F-1live:
On Sunday afternoon in Imola, Juan Pablo Montoya drove his BMW- Williams racer beside a celebratory Michael Schumacher and started waving his arms about. Schumacher, Ferrari's star, signalled back in thanks.