I have a book at school to record kids great typos and misconceptions but have had some great ones all round recently.
Boss ordered pizzas duing ofsted for late workers: 'This is reggae reggae veggie, this is normal vegetarian with chicken'
Adult: So what will you find in the pond?
Child: A squirrel.
Adult: A squirrel? In the pond?
Child: Well no, it will be in the tree holding it's nuts.
EDIT - typo