I've long entertained a dubious regard for the practice of lying to children about the existence of Santa Claus. Parents might claim that it serves to make children's lives more magical and exciting, but as a general rule, children are adequately equipped to create fantasies of their own without their parents' intervention. The two reasons I suspect rest at the bottom line are adherence to tradition, and finding it cute to see one's children believing ridiculous things.
Personally, I considered this to be a rather indecent way to treat one's own children, and have sometimes wondered whether a large proportion of conspiracy theorists owe their origins to the realization that practically all the adults in the country really are conspiring to deceive children for no tangible benefit. However, since I began frequenting this site, I've been exposed to the alternate viewpoint that this realization may be good for developing rationalists, because it provides children with the experience of discovering that they hold beliefs which are wrong and absurd, and that they must reject them.
So, how did the Santa deception affect you personally? How do you think your life might have been different without it? If your parents didn't do it to you, what are your impressions on the experience of not being lied to when most other children are?
Also, I promise to upvote anyone who links to an easy to register for community of conspiracy theorists where they would not be averse to being asked the same question.
I don't remember the point in my development where I could tell the difference between make-believe and actual beliefs that something is factually true or false.. I don't think I was scarred by being misled about Santa by my parents, but I think I was pretty much a non-rational being for at least the first 18 years of my life. My main reason for not trusting people was probably that my Dad was violent, controlling and depressive, so a position on Santa one way or the other is not likely to be the most significant factor there.
However, for some reason, I've eventually coalesced into a collection of mind-parts that really don't like lying. To the point where I just couldn't tell my kids that there was a Santa (and even though I am a theist of sorts, and was "more wrong" than I am now when my kids were young, I couldn't tell them there was a God - only that I believed there was and it was OK to make up your own mind about it.)
Funny thing is, my wife is an atheist, but she wanted them to believe in Santa. [shrug]