push out bad thoughts with clean thoughts

Explain that sometimes bad thoughts enter our mind, (push 3-4 pices of crumpled up dark-colored paper balls into the toilet paper roll; they should fit snugly and 3-4 should fill the whole cardboard roll) then explain that we can replace these thought with good thoughts. (push the white crumpled up paper balls into the toilet paper roll. As you do so, it will force the dark paper to fall out the other end.