user: Mark puts his blue basketball in a wooden box. Mark doesn't know it, but this is a magical box, which changes colors of things that are left inside. After a few minutes, the basketball turns green. Mark observes what is happening and then closes the box.

assistant: Before opening the box, Mark calls his friend to tell them that the color of the basketball is green. His friend, intrigued by Mark's claim, rushes over to see this magical transformation. Mark, with a grin on his face, slowly opens the box to reveal the now green basketball. His friend is left in awe.