This 80sTees.com exclusive Christmas Vacation t-shirt is designed to look like an ugly knit sweatshirt with images of trees, falling snow, and the quote I Don't Know Margo. While hanging from his house's gutter, Clark Griswold sent ice flying through his neighbors' window. After seeing the broken window, the Griswolds' neighbor Margo asked her husband Todd why the carpet was all wet. Todd responded with the quote that appears on this t-shirt, "I Don't Know Margo".