"You don't have to scream at me"

Chair umpire Lahyani (sp?) had an interesting exchange with Roddick this evening.

Long deuce game in the 2nd set, 5th game, Minar serving, ad Roddick. A ball falls out of Minars pocket and Muhammad Lahyani calls a let. Roddicks starts his usual barking (I suppose because he felt the let was called for no reason), and Lahyani says "You don't have to scream at me. I called a let because the ball fell out of his pocket."

Just thought that was interesting how the umpire responded.