You Don't Wanna Be Helped

Jack screams to clients walking into the office, "CAN I HELP YA?" He positively falls over to greet clients, to the point of startling them. Most of them are barely in the door before they hear it. CAN I HELP YA? And none of them know what to do. There's not much you can do. If you say no, Jack will simply chase you around the office until you finally give in.