It was a wizard's prerogative to be grumpy, and Harry would be lying to himself as well as anyone else if he tried to claim he'd never acted out of anger, or even just snapped a client when they were being difficult. It was not the prerogative for wizards who offered a service in exchange for the money they used to pay rent, though, so he tried to keep that curbed back as much as he could, at least when talking to people who might eventually need or want to pay him.

"Cool. Well, El-Malloi the Second," he made sure to punctuate the 'second' part. It felt a little silly to include the number, but if the guy insisted, Harry Dresden could do silly, "you can just call me Harry. Usually clients and evil bad guys call me Mr. Dresden, or debt collectors. They really like to play nice until you tell them where they can shove their 'attempting to reach you's." He smiled also, breathing a sigh as he heard the guy at the front of the line ask another obvious question about the food. This queue was going to take a while.