"Black Panther" took in an estimated $108 million at the box office its second weekend in theaters. That's the second-best performance for a movie ever in its second weekend. After taking the crown last weekend for best opening weekend ever for the month of February ($202 million) and best Presidents' Day weekend ever ($242 million), Ryan Coogler's "Black Panther" showed it wasn't going to be one of those movies that has a dramatic drop in sales its second weekend in theaters.