"'Ello, 'ello, 'ello." (Only when delivered in a painfully bad fake British accent. If you say "hello" three times in your normal voice, I don't care.)
"What can I do you for?"
This list will probably grow. These three were uttered in the course of a four-sentence, 27-decibel conversation by the admin sitting behind me. My left eye is twitching.