Despite a slow opening two weeks ago, Shrek held onto the No. 1 spot last weekend amid the worst Memorial Day ticket sales in nine years, according to Box Office Mojo.
Since Burger King nabbed merchandising deals with two of the most popular movies of the summer, Shrek 2 and Spider-Man 2, same-store sales have been strong, with those in U.S. franchises up 11.8% in June.