A cousin of mine, when he was six, wanted to use swear words in the worst way. He asked my aunt if he could please say sh*t.
Aunt says "If you can spell it, you can say it". Cousin goes to his room and takes out a blackboard. After half an hour he comes out and says "I can spell Ooo, I tried to get around the word filter with a nasty word.. Can I say that?".