Here's a teacher who told a class of 6-year olds that Santa, the Tooth Fairy, and the Easter Bunny are make-believe:
Yeah, another idiot southerner. Apparently some of the kids were pretty devastated.
I didn't figure it out until 3rd or 4th grade and told my parents in 5th grade that I "knew". My son is in 5th grade and hasn't said anything yet, although he did catch me red-handed playing Tooth Fairy a few months ago.
Who knew when? Good stories about unmasking your folks as these mythic creatures?