It's actually common for houses to burn down from lint fires, so something to be concerned about. My dad's a Fire Captain and says the #1 cause of house fires other than kitchen fire is laundry related fires. My house almost burnt down from having the lint in there. Now we of course check every time we use it.
I was always a cynical child so it was hard to convince me of anything. I told my Great Grandmother Santa wasn't real and she got pissed at me. She was like, "YES HE IS! I HEARD HIM COME DOWN THE CHIMNEY!" And I was like, "We don't have a chimney." I was six at the time. She also tried to convince me that a six year old should have a credit card I was like, "No." And she's all "What do you know? You're six." If I was older I probably would've came up with a witty or sardonic retort.
My brother convinced me of something though. He was good at that. I forget what it was, but I remember having a good laugh about it and even years later he holds it against me. "Remember when you fell for that" kind of thing.