I used to think I was the only kid who felt this way, but then I read this in David Sedaris' hysterical "Santa Land Diaries" (Holidays on Ice) about his experiences as a Santa's Elf at Macy's:
Some of these children, they get nervous just before going in to visit Santa. They pace and wring their hands and stare at the floor. They act like they’re going in for a job interview. I say “Don’t worry, Santa’s not going to judge you. He’s very relaxed about that sort of thing. He used to be judgmental but people gave him a hard time about it so he stopped. Trust me, you have nothing to worry about.”