Last week's Task

My task last week was to get someone to believe a truth is a lie. I went to Barnes and Noble a couple of days ago to buy a movie and I had a coupon for 15% off. The coupon was for books only, not movies. When I went to the register to buy the movie, the bookseller told me I couldn't use the coupon because it was for books only. I told her that I called the bookstore ahead of time and they told me there was a misprint on the couple, I could use the coupon for my movie. She accepted the coupon and applied it to my purchase. She believed me even though it was a lie!!