Max wakes up in the morning and waits to hear Harry stir. If Harry so much as clears his throat, Max shrieks: "Bruba! Bruba!" At the park, if he can't see Harry, he toddles around calling out "Bruba!" He loves his brother, that one.
(I apologize for the darkness at the end. It showed up on my camera. The giggles you hear are from Max who jumps on bruba's bed.)