"Daddy? How did I come into this world?"
"Well, my child, someday I'll have to tell you anyway."
"So why not today? Please!"
"OK, but listen carefully."
"Mom and Dad met in a cybercafe. In the restrooms there, Dad connected to Mom. At that time, Mom downloaded some files from Dad's memory stick. When Dad finished uploading, we realized we had used no firewall. It was too late to cancel or delete. Nine months later, we ended up with a virus."