LOL - this has been an ongoing argument at our house for years! Interesting, it is my brightest and most logical child (rising 5th grader) who persists in believing in the miracle of Santa claus and in giving the tooth fairy the benefit of doubt. His twin has spent the last two years trying to argue him out of his belief. If it helps, there were some other 4th graders who shared my DS' faith in Santa and none of them have suffered any particular ridicule. The funny thing is that I never set out to create the santa myth or take any extraordinary efforts to "trick" the children. I think that it is somewhat related to the suspension of disbelief required to enjoy certain literature and movies.