Topping the weekend, Hop hatched an estimated $38.1 million on approximately 4,700 screens at 3,579 locations, narrowly edging out Rango to claim the highest-grossing opening weekend of 2011 so far (if the estimate holds). In second, Source Code generated an estimated $15.1 million on close to 3,400 screens at 2,961 locations. That was ho-hum compared to the starts for its fellow sci-fi thrillers currently in theaters, Limitless and The Adjustment Bureau. Insidious debuted in third with an estimated $13.5 million at 2,408 locations, which may be a solid showing for the inaugural release of distributor FilmDistrict but was below par for a supernatural horror movie. As well as the three new nationwide releases may have done individually, collectively they couldn't match the three debuts on the same weekend last year (Clash of the Titans, Why Did I Get Married Too? andThe Last Song), leading a 28 percent drop in overall business versus last year.