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The phone calls were driving Ray Chang crazy. His seven-employee company,Motorsport Lab, was hours into its firstGroupondeal--a one-hour supercar driving session priced at $89, a whopping 82 percent discount--and the number of calls flooding the Boston office was out of control.

“这是mayhem," recalls Chang, whose company sells driving experiences in exotic cars such as Ferraris and Lamborghinis to New England- and Arizona-area marketing campaigns and events. "We were keeping track of all our appointments in Google Docs. When we sold 1,500 Groupons that first day, I thought, How are we going to make this work?"