It may be a stereotype, but it's true, according to data CNBC analyzed: Emergency visits to the dentist spike by 64 percent across the country the day after St. Patrick's Day — apparently from drunk revelers knocking each other's teeth out. It's not just the Irish who are punching each other's lights out or falling over drunk, either; the most affected states aren't correlated by ancestry, the data show, suggesting that it's a broader swath of people who are getting into fistfights. The worst offenders? The data suggest those would be people in Delaware, Mississippi, Maryland and Nebraska, which all see a jump of more than 150 percent in dentists' visits, while Vermonters are relatively tame.