This topic from Long and Short Reviews was an interesting one.
Like most kids, I believed in Santa for a long time and would hide out in my room all night to avoid seeing him, since I thought if I saw him he would vanish with all my presents. But then something happened which removed all the mystery.
I left him a note.
I had forgotten to ask for a particular present, so I left a note under the tree asking if he had one spare.
The following morning there was a second note left saying he had run out and to ask him again next year. I wasn't that disappointed (and I ended up getting it for my birthday anyway) but I couldn't help noticing the note was in my dad's handwriting. Funny that.
I'm pretty sure I didn't tell him I'd worked it out for a while, though.
So what did you think of Santa as a kid?