Despite it's all-star cast, "Rock of Ages" ekes out $15.1 million opening; "That's My Boy" grosses $13 million, marking Adam Sandler's worst opening for a comedy in eight years... Instead, it was holdovers "Madagascar 3: Europe's Most Wanted" and "Prometheus" that continued to top the chart, staying at No. 1 and No. 2 respectively with $35.5 million and $20.2 million.