Teacher to students: "Please bring the white paint from the other room."
A few minutes later the students return: "There is no more white paint."
Teacher: "Are you sure? I think we still have some white paint left."
Students: "There are other colors, but not white."
Teacher goes with students to check and opens the paint bucket.
Students: "The paint is green."
Teacher: "That's because it needs to be stirred."
