Ralph Harajda, who has waited on his share of celebrities in his 12 years at Grimaldi’s, found Michelle Obama “very pleasant to serve.” . . .“I really have to say that she was very very nice and I was pleasantly surprised,” Mr. Harajda said. “I was expecting her to have her nose in the clouds, but she was nothing like that.” The party was also “very generous” tip-wise, Mr. Harajda said. “They loved everything,” he said. “I think they said it was better than Chicago pizza.”