Grown-ups stormed the movie-theater barricades this weekend, taking back the screens from the younger generation and for once not letting a silly teen movie be No. 1. Robert DeNiro and Billy Crystal in Harold Ramis’ very funny “Analyze This” took over the cherished spot with an estimated $17.7 million opening. De Niro plays a John Gotti-like mobster who seeks help from Billy Crystal’s neurotic therapist. No. 2, with $13.2 million, was the teen movie “Cruel Intentions.” The other winners: “8MM” ($7 million, a 51% plunge from last week), “The Other Sister” ($5.6 million) and “Payback” ($4.1 million).